Yes, Krita is in first line an painting tool (profesional level), but also has photo editing and even animation capabilities, enough for most tasks, even RAW format, the flaw of Gimp. I use both, Krita and Gimp are good complementary apps. For vector graphics I've enough with Libre Office. And yes, MiniPaint has a misleading name, it's a very powerfull editor, nothing Mini. Well, it isn't PS, but way enough for almost all editing tasks, it's blazing fast (Html5) and ideal for editing something on the go while browsing.