I really like the content of some of your pics.
The only problem is I'm struggling to see what's in them!
Take this one, there's a scorpion, but you can barely see the dwarves that it's fighting against. You've got one light source, the torch on the wall, but you shouldn't let it impede the content of the pic (plus it begs the question on why the scorpion is more well lit than the dwarves). Also for a fight scene the dwarves and scorpion are in unexciting poses.
If you can push the values in your pics so that we can see your characters, I'm sure you'll pick up a lot of followers for your fantasy-art scenes.