I like the art and shading put into play here. Only problems I have are that the female character seems a bit out of proportion, and in the hunting scene the ulbernaut is in a really awkward and goofy pose, while the female alltogether seems like she was copy/pasted in there from a different drawing where she's finishing running a marathon and the prize was an axe and a ginormous sword; the weapons aren't poised in a very effective manner. Her eyes need to be interlocked with the eyes of the ulber: both are scoping out their prey, going in for the kill. It would give the scene a whole lot of a more "active" feeling. Right now, I just see a girl with her arms thrust back about to be bear-hugged by an ulbernaut. If she was leaning into the kill with the weapons swung back, it would look less like she's trying to bang heads with it and more like she wants to cut the head off, which I'm sure is her REAL intention.
Otherwise, your talent is very evident. The amount of detail in the pictures is astounding. Though I would be careful: some of those lines tend to look less like Ulber fur or armor, and more like random scribbles to fill in negative space. Although, considering you're using Gimp, that's understandable, and I forgive. Gimp is tough to work with.
