Nice drawings, realy like the Kran and the dwarf.
A couple of coments though. First - backround vs. object. The white background realy stands out way too much, so the first thing one notices when looking at the picture is the background, also the soft edges arnt helping. You could make the backround darker, add more contrast to the drawings and make the edges less... fuzzy. Now about the tiger(?). The eye lacks some critical detail. The upper eyelid should go over the lower eyelid, this affects the "realism" of the drawing very much. The right eye also looks to large and the left too small, even for this kind of facial expression. Heres a quick eye study on a googled picture:

Its actualy similar too a human eye. The back of the head could be more rounded, the nose looks small and is way too far from the eyes.
About the dwarf: its done very well, however i did notice some awkard things. The fingers seem a little too short even for a dwarf. The tips of the horns are too sharp imo, makes it look wines. The mustache looks a little too squery. The beard is too wide, makes the chin look abnormaly wide too. Im just way too lazy to type more, so ill leave it at that. Of course all the above mentioned stuff is my subjective opinion, so its likely to be wrong.
Good work and keep em comming
