How to correct those black areas

[Darek K]

Hello friends from Affinity forum.

I know +/- how to get rid those areas but maybe there is better way to do this.

This is something like that :

https://www.youtube.com/watch?v=QZxkEXEWV2Q&t= and

https://www.youtube.com/watch?v=xzty5IpMWGk&t=

But those are PS specific solutions.

Second screenshot this is my result, but could be better.

 

Thank You