to smooth out colors, try erasing the edges of your blocks of colors w/the eraser on a pretty low opacity, then blurring it. for more 3-dimensionality, you have to develop your skill with light and shadow; namely the use of 'core shadows', which are very important in creating that 3d look. i don't think i can explain it adequately, so look it up. i'm sure there are lots of drawing sites that can explain it pretty well. anyways, this is looking really good so far! i especially like the lion. ^___^