I could say what I am about to say for this piece, but I could also say so in general for a lot of your work. From a distance, it looks alright; up close, it lacks depth. And it pains me to say what I just said, because your composition is quite good.
I mean, here, for instance. You, as the artist, know where the creases and details are on Link's clothes. To me, the viewer, they don't look well defined at all. Apart from that white little diamond thing on Link's right sleeve, everything lacks crispness and definition. Link has paper arrows, it appears to me -- I know it's not the case, and so do you.
In fact, I could safely say it's the shading styles that are causing this lack of depth. Don't get me wrong, it works in a couple places -- Link's hair for instance, or the wood on the back of his shield. And to a degree, his boots too. The shadows on the fingers are really well done as well. But everything else seems to use this same kind of shading, from hard surfaces to soft ones. The cliffs are shaded just like Link's hair and trousers, for example. It just doesn't *feel* right. And I know, because I've made the same mistakes before when I used GIMP some six years ago and drew in this style, and felt something just didn't feel right.
Now that I've gone on the negatives, let me go to the biggest positive I've seen in this drawing.
Your anatomy and knowledge of poses is amazing. And I mean, sure, every artist has to do work on anatomy to be able to draw half decently, but you appear to have a clear grip on it here. Also, Link's facial features are so well-defined, they give him a sort of tribal look. I like. Probably the best-defined thing in the entire piece.
TL;DR: Amazing anatomy and pose. Good composition. Please, please, please work on your shading. I know the image would look absolutely majestic but I just don't feel it right about now.