for the shading, say on the smoke, layer it up very very lightly, use the translucent mode of the brush and don't use black, use a translucent grey colour and then just go over it til you are happy, the lighter the grey the better, that way its harder to make a mistake
light direction is also really important, pick the direction it comes from, and go from there. draw a few cubes and spheres, get used to the flow of the light .
keep us posted too
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