My first critique. Lets see how I do. Lets do this.

Alrighty, let me knock out the minimal negative aspects, because I have a lot more positive things to say than negative. Bear with me.

Firstly, the occasional random lines. The right leg has white lines crossing and interrupting the color of the leg piston (hydraulics?) making it look disconnected. Same goes for the fins at the top. Also, its left arm (our right, its left) has seemingly random lines connecting and sprouting from it and part of the body, and I feel it's a superfluous detail that detracts from the firm, mechanical look of the rest of the body. Also, and this may be a subjective interpretation on my part, but the blurriness of the lower legs (especially the visible knee joint and ankles) does nothing to benefit the aesthetic or technical appeal of the image. I feel the main robot should have very clearly defined features, the edges and form of the mechanisms easily discernible, given that we're viewing it so closely and the other features exhibit that detailed definition (such as the head, top, and main body) despite having the same light source (albeit, it's actually hard to determine the exact light source, but that is a minor quibble). Even if these features were obscured by dust, which I'm guessing is the intended effect, they still stand to be more distinct and maintain the same opacity as the rest of the robot. Work on keeping the edges clean and not too smudgy. Your technique, while truly impressive, is inconsistent and some areas of the image could stand improvement to meet the quality and detail of other features. Really, those lower legs and upper left appendage need to be un-blurred.

Annnnd now the positive aspects. Firstly, it's very visually appealing. I love the intensity of the eyes (using the Orange/teal contrast to great effect) and they appear so... feline. Also, the detail in the metal of the top armor is very appealing. The minor details present really lend themselves well to the odd pseudo-realism of the image: the fishbones dangling from it, the manufacturing data scribed on the leg, the paint lines and the wires all benefit the image (although I agree with the other critic who comments that adding details doesn't mean adding stuff, but adding detail to everything). You get a 5/5 for originality in my book. Already, it's a clever, silly idea (the cats have risen up against us, you say? With giant robots you say?) that just drips imagination, which I can truly appreciate. The tiny cat atop the whole thing is a perfect ornament of juxtaposition, a tiny furry critter leading the massive robot march. It image itself is a very intriguing scene, especially with the other robots emerging in the background warranting intrigue of just WHAT is going on.

My favorite part of this whole piece? The background robots. They make this image for me, and really drive home an impressive impact. The actual technical execution is just fine, and I can't say anything overwhelmingly positive and certainly not negative. The blurring and low opacity is understandable, given that they are further in the background and obscured in dust at a reasonable distance. I love the eyes and blank faces, and the implication of there being more cat-overlord minion robots (a pairing I find cute and engaging) emerging and doing their bidding. Provides the implications of what is happening in this scene all the more intriguing scope of what is going 0n. I'm hoping for a longer series of strips.

The impact of this piece is a clear 5/5, subjective to me, as the ambiguity of the circumstances, the creative design, the execution, and the imaginative concept that is so odd that it provokes thought all contribute to my desire to explore this concept further and develop it, and that is a clear sign above all others that this is quality work. When an artist inspires in his viewers the urge to create and explore and expand on his/her creation, you know you've do something correct. An artist should always hope to elicit such an involved and intrigued response, and you certainly have me fancifully ruminating on the subject of this image. That is good impact and imagination.

Good job. I love to skim your gallery, actually. Great picture.

So here we have a really original piece. Yes, Sir.
Lets go with the critique.

First of all, I would like to emphasize how incredible the idea of the picture is and how nice everything is balanced.

The story you wanted to tell here is amazing and I bet you got it.
Did not want to give you five stars because I would like to show you that you can improve your own way but never is a top you can reach and stop. By other hand you can be sure your style and colouring skills are what give this picture that "magic" that can tell us a story and fills it.
As a weak point maybe, for the next time, you can balance a little more the differences betwen shadows and highlights on a character or the bodies on the picture. Have a look! The main machine here has to many differences of color and shade on that aditional top pieces. You have to get in fact that.

Another point is those background machines has the same highlight opacity but are not at the same place. Light should not be the same for both. Next time try the one on the backside a little less dark and the other one a little more when light is, like in this picture, on the back.
It tends to become darker when farder of light.

And those details... The details you put are fine but making details does not only have to be making stuff. It also means detailing everything there! I believe you can because I have seen much more from you.

Well, if I have not forgot anything, this is everything. Hope you can find this little critique useful.