Hmmm yeah... bottom left is nice. If you've been looking at it too long it's best to just leave it for a few days and look with some fresh eyes. Colours especially tend to bounce off each other and you can get carried away if you work on one thing too long... I've had some assignments that in hindsight look dreadful colour-wise, that I hadn't noticed at the time due to staring at it too long. Lovely fun design though~
Hmm, yes the bottom left one is good, the complimentary colors of the monster pop him forward. And the background is nice in neutrals, the lining for the flowers has a nice hint of yellow to them while the one right next to it is a little too gray and washes out the background.
I also like the top middle one if you're going to something a little more subtle but not washed out Hope that made sense