For crisper images in photoshop try going to filter/sharpen/unsharp mask.

Mess with the settings there and it usually does a better job then the generic sharpen filter does.

For crisper cleaner images try image/adjustments/brightness-contrast

If you have a model that looks to white, or is off color due to fake tanning solution, or needs a bit redder fleshy tint to her skin try image/adjustments/selective color Adjust the colors red and yellow with the master colors being red or yellow. You'll see what I mean when you first try it.

Let us know how it goes!