The monster's pupil feels a little out of place, as if it may be too illuminated compared to the rest of the landscape.
Other than that, keep up the work. I look forward to seeing more of this kind of stuff!
I agree, I had a bit of trouble picking the colors for the eyes. I thought it looked "ok", so I just left it, probably could have made it look a bit better...
Cool style, I like it. Colors are great too