Correct.... i agree... most of the people on deviantart will say like and *fav* just because when what you need to get better in your artistic style is a little bit of critisizm...
The line work, shading, dynamics of posing, is far superior to what i've been seeing in the forums. I like it... just as pointed out the colors... the colors... need to change...
Your style... actually would do alot better with a more vibrant color scheme... while you might prefer "darkness", a desaturated style such as your will easily become one of the more overlooked (and underrated) art pieces on DeviantArt... if i were you.. i'd consider looking into a brighter style stat... not to critisize your style cause you're a awesome artist... but... you should definitely invest in a far more saturated style than the one you've been using....
but i'd like to see how this piece comes out... who knows, try it with more saturated colors... you might like it... Mr. into-the-darkness...