I like the version that you linked to CELS a lot better since there is more texture on the hood and the copter blades cast a slight shadow. 

Thanks for the feedback :3

@Manupix I don't really know why. I tried looking at some rotor references, but most of them are in top view and I was aiming for the 3/4 view; I tried searching for the side view images but it didn't help, so I went with what I though looked best.

I have made some changes. Apparently, I can't post images because, when I right click a smiley I inserted, options don't appear :(

I have added a stem-like shaft, added a shadow below and did some other stuff too. I dunno how am I gonna fix the rotor though ;_; It's already animated and stuff, I don't have any rotor/clover side view references and I don't have much time either.

I like this! But why did you pick this angle of view? It's the worst possible for the rotor, which should be the focus!

You can probably fix that by giving it a stem-like shaft, tilted or bent toward the viewer, and draw the rotor in a less grazing angle. Preferably with flexible 'blades' / leaves!

Good dithering texture, but why should everything have the same? Vehicles have glossy parts that don't need any.

The front wheel could be bigger to emphasize perspective, also most of the tyre details should be lost in shadow.

Is the vehicle in flight or on the ground? If in flight, the wheels should dangle; if grounded a cast shadow would help. In both cases a subtle wheel anim would be nice.

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To post an image: insert a smiley, right-click smiley, image properties > change url.

I disagree, I  think this looks very nice, sort of like a spray-paint texture. It matches the spore-y particles in the back, too. 

One of your best!

Is this fine?

http://i.imgur.com/vttk3QC.gif

I tried to reduce the contrast. But I dunno if I reduced it enough...

EDIT: Umm... how do you put a picture in a comment? I've heard of the [img] BBCode but it apparently doesn't work here...

I really like this, but the contrast is too high for this kind of dithering, I think. Especially on such a small space.