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I think Ibis Paint is an alternative for Photoshop. But I still prefer Photoshop bcuz, in my opinion, their layers thingy are far more flexible than Ibis Paint. Sorry I can't recommend you any alternatives cuz I'm a Photoshop user for more than 10 years. I already used to it. Hehe. 😂

Krita?

Gimp?

Krita been really useful for me, the only complaint I would have is the lack of proper support for text editing.