Yup tracing is fine for studies! Or try to copy it side-by-side and then pop your drawing over it and reduce the saturation, and see where you're off. I've done that a couple times.
It also helps to know what categories of fundamentals there are, and which part of it it is that artist is good at. Say, you think the colors look great in a piece... But that's maybe because of the values that make the right colors pop. Or the pose looks cool, so of course it's their anatomy! But really it's the composition as a whole.
It's tricky, but just go through all these categorically for a piece you really like. Take an image and make it greyscale in photoshop, zoom out, and you'll see the value work. Smack a filter on it that reduces it to color blobs so you can see the color scheme. (Don't blur though, that destroys the colors). Do both so you only have the rough value blobs, and you'll see the underlying composition. Find the line of action. Look at the silhouettes. Draw perspective boxes over it. (Heck you might find mistakes even, nobody's perfect.) I'm sure there's even more you could do!
That's my general method. But to help you with this specific one, I think it'd help if you posted something of hers you like and then your rendition of it! A second set of eyes can help a lot!
Oh and remember; this is a fine thing to do as long as you do it to improve yourself, but not to become "just like artist X"! Remember to value yourself (;