I find non-Photoshopped images prettier myself - I find that celebrities on posters and magazines look like dolls - however, I'll offer what I've observed here. It's not bad for a first 'shop. You appear to be making liberal use of the Smudge tool. If you're going to Smudge part of a grainy image, you'll want to Smudge all the skin, which takes hours if you want it to look right in the end, and you really have to watch where you're mixing the lit and shadowed parts of the face. I'm not sure what exactly the pros do for skin, as I've only taken very basic classes in this kind of thing myself and the bulk of it was web templates. Rather than liquefying the lips to be poutier, I'd suggest seeing what you can do about the more prominent of the wrinkles. I'm not suggesting erasing them entirely, as that'd make them look too dollish, but just making them more subtle would probably suffice.
Also, GIMP is free; it's not a bad idea to get it if you wish to learn how to work the program's magic on your photos.
