The dog bat/dragon thing is pretty cute but it just feels a little rushed.
I did a redline to show what I mean. It just feels like a lot of the lines were curved when they shouldn't have been or things were too large.
You are clearly talented though so keep trying. I am sure these are probably just rough sketches you started off with.
Remember, if you are using photoshop and you make a mistake or a line doesn't look perfect Ctrl + Z or Ctrl + Shift + Z so you don't just end up in a loop of undo and redo
razz
I hope to see more of your work in future