G'day dafg, and welcome to the spriteing zone, but now for the sprites.
The first has a number of problems. The recolouring is
okay, but the flame looks messily copy and pasted. The smoke as well, looks rather splattered on rather than anything else, and saving it as a .jpeg doesn't really help :/.
The second sprite, has slightly less problems. The idea, as Absy said, is good in premise, and I look the sprite generally. However there seem to be a lot of stray pixels around the point where the leaf is attached to the bell pokemon. The smaller head might be a bit pixelated around the edges, but that might just be me.
I sound pretty nasty right now, so I do apologize if I have offended, but if you do take mine and Absy's tips into consideration, I'm sure that another batch of sprites will look good