These are 1-4 hour digital paintings (fanart, for different properties) done as a challenge with specific color palettes, posted first on tumblr.
Padme Amidala, done in 4 hours.
Kamala Khan, done in 2 hours,
Ms Marvel, done in 2-3 hours.
Martha Jones, done in 1-2 hours,
As a disclaimer: none of the characters depicted balong to me, but I did create the art :)