I see. Might want to word it a bit better then, eg. "Design a scene featuring one of these robots..."

So, we're meant to put a solid color background or something? I don't really understand.

Transparency should be yes, shouldn't it? Or am I missing something?

Thanks for the comments guys. I agree that the wrinkles aren't great. I had a few attempts at them and couldn't seem to get it right. As for the chin, I don't have the sharpest eye when it comes to shading, so I can't quite picture what should be different.

Oh, what...? Why would transparency count as a color? I already made mine with 8 colors + transparency and taking one out would ruin it :(

 Very pretty :) A little bit more contrast between the shades of grey on the tree trunks would help I think.

 Thanks guys :)