A non-smutty otter picture :D It took me approximately 5 hours to finish. 26 inpaints, and a dozen of manual edits.

I have tried Krita as per JamesA's recommendation but eventually I returned back to GIMP for editing purposes. I use the Smudge and Heal tools quite a lot for manual edits and I didn't like how they are implemented in Krita. They aren't, like, actual tools; instead, they are special brushes with no real-time WYSIWYG previews that compute the effect once I release the mouse button, I found it very inconvenient. I can't wait for a stable release of GIMP v3 to finally release :P Nevertheless, I will give Krita more tries in my future project. Thank you for your advice, JamesA! <3