#DatPonytail lul. It is cool though. (Buut I'm...a bit biased.)

And :P shading is a kinda tough thing until you learn about lightsources and color theory and the like. After you get that stuff down somewhat, shading's not so difficult.

-Shadows are darkest where they begin. (I've seen a couple exceptions irl, but MOST of the time this is the case.)

-A shadow's coloring varies depending on the colors of the surroundings and color of the lightsource(s). In a dark indoor scene whose sole lightsource is a candle, the shadows will be a warmer color than in an outdoor scene with, say, moonlight, as the lightsource. Shadows are almost always a cool/cold color, however.

It really pays to have a lightsource in mind when you begin to shade something. Decide where your lightsource will be and figure where shadows will cast on your subject. Irl references are an absolute must for learning this, use reference often until you're familiar.

--Using reference is easy, just look at your arm/hand/whatever and take notes. Note where the lightsource is (Above? Beside? Behind?) and where and how the shadows cast.

Sorry for this wall of text... lol.
My comment might make shading seem like a daunting challenge, but it's not! Just do things in steps.

Purplekecleon's "How I See Color: A Tutorial" on dA is a very good thing to check out, I strongly recommend it. I found it a little over four years ago and it helped me immensely on so many things.

This looks so cool hubby! X3