Here's a step by step of the Buzz Lightyear piece I did for Pixar Times Blog.
The rough sketch. I don't know what happened but these white blocks appeared on there out of nowhere.. My Photoshop took a shit or something.
Added light source and highlights.
Added the helmet and the stars in the background.
Switched some colors to spice up the contrast and added a trail of fire for the jet pack.
Added a few more details, mostly glow effects here and there.