These are actually pretty good~
The starter ones are good, but might look a bit better if you scratch some smaller detail onto them, such as ears and spots.
The Snorlax one is really original. It seems likes you used parts from Tentacool and/or Tentacrual, no?
With all of those sprites you may want to work on shading. On teh Charmander fusion the bulb on its back is highlighted where it should actually be dark because of the arm covering it. On the Charizard one the areas under the leaves are bright, when they should be dark.
This will probably be fixed with some more practice, though.
Keep on spriting