@Messi Mil Grau What technique did you use for this cutout? There's a lot of “snow” (visual artefacts) in the hair, which is very prominent against a dark background. I'd recommend using remove.bg to cut your images, as it automatically creates a good resulting cutout.

Here's a thread with some tips and guidelines and the below videos should help you out too.

How best to use remove.bg with Photoshop:
https://streamable.com/tgfkx1

How best to use remove.bg with photopea.com (both free online tools):

https://streamable.com/rt6u8e