Oh, wow... sorry for my long silence, I didn't realize I was still getting replies! Thank you all.
I took a bit of a break from this one and then came back to it. Craig, what you said about extractions retaining all the old shadows really helped -- I went back to my original image and really looked at where the shadows fell. Then I basically tried to recreate them, but with a cleaner overall look.
Since that shadowed leg was being such a pain, I purposefully made my lighting even more spotlight-like in an attempt to work with it rather than fighting it (cause fighting it simply didn't seem to be working!). It was great to see you guys' take on it, and it helped me come back to it again with fresher eyes. Here's what I came up with -- I'd love to hear any more of your thoughts or feedback on how to improve it further.
(edited cause my grammar is terrible, ha!)