Well, then it looks you’re basically there, as long as it looks good in motion and doesn’t flutter at the edges. Just a bit more blur, which you can add to the matte.
You may want to add a “light wrap.” That is often added to a key, especially if the new background is lighter than the subject. A tutorial for technique should be easy to find.
For good in-depth tutorials, you might want to check out Lynda.com. They have complete courses and very specific and clear tutorials. They’ve got a monthly membership cost, but you can do a free trial and see if you like it.