I've only seen this posted on PJ before, where feedback usually takes the form of "ooh this is awesome" rather than critique, since it's a gallery for finished work and therefore most nitpicky-type feedback isn't very useful, as it's too late to implement it.
In addition, it's clearly very competently done. People might not feel qualified to give you critique. But at the same time, the apparently-intentional colours are a bit unpleasant to look at, so people might hesitate to give generic positive feedback.
I think I gave feedback on the orange/blue on PJ, but even I was hesitant because the colour use seems deliberately "odd" so I didn't feel that feedback was useful.
Another bit of feedback I can give is the AA is inconsistently applied, which looks a little strange. For example, the dark shadow from the foot is AAed where it meets the dun surface, but not where it meets the orange sky. Similarly, every object seems to only have internal AA, no external AA.
I'd extend the canvas on the left (or crop it on the right) just a little bit so that the character's face isn't so far to the left.
