I assume you've tried Gimp, not exactly the same but decent.
I have, some five years back. Generally okay, unless you need a bit more for print publication, higher resolutions and colors. Not sure how long I will worry about those spec needs since everything is getting so "dumbed down", including the print trade...which is about to pass the same way as the Dodo. (Different topic)
I'm looking to Linux to extend the life of perfectly good hardware running excellent...but is a bit short in hardware specifications for new iterations of Windows and Office.
I'm not looking to migrate from Windows to Linux. I will continue running Windows. I am looking to keep assets in play with improved apps to avoid expense. Developing code and text, email, spreadsheet and database --- functions of doing business --- is "work". I want to do work. I'd like to see what Open Office can do in a Linux install instead of the Win port (which did not impress me all that much). As much as possible I want to compare apples to apples and see if I get apple pie.