Yeah, I don't know how to smooth that with Photoshop, sorry.
I think Portraiture has a free trial period, so you can try it out. https://imagenomic.com/Products/Portraiture
Hi @OrlaO, Brian will be along to give you some specific advice before too long.
In the meantime, here's a thread I found: https://ask.damiensymonds.net/topic/23973-best-recovery-software-2019/
Well, I'd rather not waste either of our time editing photos that you don't actually intend to use. Since you like this photo of the two girls against the green backdrop, I'd prefer to concentrate our efforts on finding a style that works for them.