4th is my fave, brill composition and i love the brilliant pose!. Though I feel it needs a bit of a fiddle white balance wise (more red, less blue and green), and possibly brightening a bit. I can tweek it for you if you like, I have had lots of practice (example for ya.. http://i43.tinypic.com/e05phk.jpg)
They are fab for a little girls bedroom though!! and SUCH sweet a sweet mouse/mice
I use photoplus, but its basically the same. Umm, tis a bit difficult to explain without showing, but it's all under the "image" options, I messed with the "colour balance" and the "curves" a bit. If you can't manage to do it, I'm quite happy to fiddle for you if you send me the full size pic/s via email or something?