Looks most excellent! I love all the detail you've put in to it; and, for the most part, the anatomy is very well done. The face looks very good! I like the soft browns you've used in the background, as well. :3

As far as critique goes; I'd say that the shading, while section-by-section is nice, is a little flat overall. The way you've got it now looks pretty much as though it's being lit directly from the front; which tends to produce rather monotonous results. It also seems to be colorless; remember that the colors in your piece are very dependent on the lighting situation, so while the object may be blue, it may not show as blue in different lighting.

A more dynamic approach would be to stick, say, a strong gold from the top right; that way you could put some sharp gold highlights on the armor and hair to add some color, and then throw most of the left side in to shadow to help portray a sort of mysterious nature. That way would also really define the shapes of the character, making his form read much more clearly.

Also, don't be afraid to add color to your work. While the power of digital art is easy to abuse; if used properly, you can make your work really dynamic by using gradient maps and blending modes and things like that to make it very colorful and atmospheric.

And, to better explain myself, here's a quick paintover showing what adding some more solid shading and lighting can do: [link]

But you've definitely got a good start here! The details are great! Keep it up!