There is not really a definite light source, you're pillowshading (creating an impossible shading according to your idea of light, not the reality of light). See the difference in this tuto.
You're getting better at it.
Suggestions on the skull, use more contrast between colors, don't use too many colors and try to not use many outline inside the piece, just let the shadows "shape" the skull.
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What Daruda said.
There is not really a definite light source, you're pillowshading (creating an impossible shading according to your idea of light, not the reality of light). See the difference in this tuto.
Nice colors, you should try to work on your palette in a more organic way.