[chansiky]

If you want something more professional you can look to the Affinity products which have a very reasonable one time fee:

https://affinity.serif.com/en-us/

I personally like Affinity Designer and have designed quite a few things with it. They are behind illustrator on features, I can't deny that, but I've been able to find answers to everything I needed.

Also they have solid developers working on the app. Check out this technical explanation of performance improvements to their rendering pipleline:

https://www.youtube.com/watch?v=JnfxzknVK_0

For a photoshop replacement, however, I would say Krita hands down. Again, its not as polished as photoshop, but I prefer it over Photoshop at this point even with all its rough edges. I really need to make a video or something about how to set it up and use it correctly but I think its got a lot more going for it.