I found this on steam while looking around for graphics related stuffs this morning. It looks nice but have not tried it.
https://store.steampowered.com/app/432030/Swanky_Paint/
Note at the end of feature list on the above page:
These are some of the features that are already included in the current version. We are still adding more during development.
Features:
We don't have a file format - anything created on Swanky Paint can be opened in ANY art software
Runs on Linux, Raspberry Pi, Android, Windows & Mac
Deluxe Paint shortcuts
Escher modes: Hexels, non-Euclidean, strange geometry
Bloom shader options
Full resolution background image for tracing and referencing
Multiple layers support
Simple animation frames
Spritesheet support
GIF and APNG import to frames
Supports SVG, GIF, JPG, PNG and APNG import & export
Supports Fun64 clipboard conversion to ASCII
Dithering options for paletted and true colour images
Wrap mode for tiling preview, edit anywhere to update the draw area
Ultimate undo remembers your history forever
Export your image history as a GIF
Supports 15 popular colour palettes like Pico8, DawnBringer, C64, ZXSpectrum, NES, Gameboy, MSX, AppleII, EGA, Swanky32 & more
Import custom palettes and presets
Support for Lua scripting
Support for UV mapping preview on to low poly 3D model
