I agree with everything the others said so far. The only thing I would add is maybe try to give the baby slightly more cartonny proportions... Especially the head feels a little small compared to the rest of the body. But I really thing this could be a strong portfolio piece :)
I would agree with the others that the 3rd one looks more natural. . . however, if you are drawn more toward the purple, I'd say go for it but explore a little more with thumbnails, tweaking the purples. I think if you made the background a cooler or desaturated purple and kept the dragon a little more intense and warm it might help.