Scotty is looking really good there, Eagle.
Gamera has offered good advice on the fingernails and eyes.
If you want a bit more detail, you've got excellent reference material right in front of you, you're own hands. If you look, generally the nails are more pinkish and slightly lighter in colour. You might notice a bit of a lighter crescent shape near the skin at the base end. If you add that, make sure it is a subtle shift in colour. Some other generalities:
- the palm side is slightly lighter
- the finger tips and knuckles/joints can do with a very slight redder tone
- veins, draw them in from a mixture of your skin tone and a grey/blue, then add some highlights with lighter skintone
EARS
- this one can easily be enhanced with a light application of a red/brown wash, the ear hole itself can be made slightly darker
- pick out some highlights such as the ear lobe, and the section just in front of the ear hole, and the top of the ear - just don't dry bush the whole thing in one swipe, at this scale it just won't look good
LIPS - they can basically be viewed as two planes. You've got a good start with the dark separation line. Next, the upper lip faces away from a light source, so it should be darker. The lower lip is the opposite, and is exposed to light, so make it lighter and a bit more richer in colour. Can also add a highlight here.
EYES - I always prefer using an offwhite as the base, mixed from skintone and blue. This allows to put a highlight afterwards, and white itself is just too stark. Add a spot of pinkish red on the inside corners, as well as a line along the lower eye lid. A light red wash over the completed eye, (but before you add the white highlight in the iris/pupil) also does wonders.
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I think I've linked this before, maybe not this thread, but here's an excellent toot on painting eyes;
http://www.planetfigure.com/articles/eye_tutorial-mark_benette/eye-tutorial.html
Recently found this step by step for painting faces, and also includes the hands. The author interestingly starts off with a black primer base...
http://lifeminiatures.kr/140178056263
From the main page, click the 'step by step' link, followed by the helmet wearing German w/white eyes.
regards,
Jack