I know pretty much all you hear on these forums is just flattery, which is fun to get, but if you don't get a serious criticism, you're never going to get better, so here I go:
I have a problem with a lot of the hands and feet in your creature drawings, they seem out of proportion with the rest of the creatures, and the feet in particular face at odd angles when they touch the ground. Like the front legs of the horse-like thing in your latest 'creepy' drawing. The angles at which the feet are pointing are all the same, save for the front left, which seems to be protruding forward. If that creature were 3-D, the legs would all be different lengths and they'd be in a very uncomfortable position, not at all suited for carrying the weight of the other creature.
My advice would be to draw skeletal stick figures, and not skeletal in the traditional sense, with bones and that sorts of thing, but just very, very basic mannequin-like people/creatures with all the proper joints and proportions. I'm no teacher, so looking up a quick tutorial online would be a great course of action, and from those sorts of drawing excersizes you'd learn a lot about posture and how weight is carried, which will significantly improve your sketches.
And remember, I wouldn't write all this up if I didn't think you had any skill.