Looks really great.
some crits -
-the guy is a desert kind of dude. the color scheme should
indicate that (using the existing colors which are good, only adding several "desert warm" color and overlay layers. )
-some more contrast + light and shade work is needed too.
-the white BG is a bit harsh, and some surounding color for the figure might help soften it down.
here`s what i mean (hope you don`t mind.):
that`s my 2 cents.
keep it up.
We all pay for life with death, so everything in between should be free.
According to the book, the stillsuits are grey. However, I agree with Chuck on the desert-ish tinting, a warm sandy grey like he suggest.
Also, there's no white in fremen's eyes, their eyeballs are supposed to be entirely blue (except for the pupils).
IMHO you should add the nasal tubing. It was a vital and characteristic piece of the stillsuit. There are quite a few descriptions in the book that include the scar that the tubing leaves, being that a feature of a deep desert fremen.
For the rest, its looking reaaally good.