Steven Universe: Save the Light
20 Achievements
1,000
25-30h
Work of Art
Help Vidalia finish her masterpiece
25
22.52%
How to unlock the Work of Art achievement in Steven Universe: Save the Light - Definitive Guide
After I beat the ice boss I returned to town and she had finished it. After clicking through dialogue she gives you the picture and the achievment pops.
Somewhat but not really related I also talked to sour cream and gave him his 9 glowsticks, he will give you one making it 10. Don't waste your time in the forest looking for the 10th... heh... heh... notthatididthat...
Vidalia can be found in the NW section of town. She will be struggling to think of something to paint, and will take your suggestion. I don't believe it matters what you choose, but I selected Amethyst since that's what she does on the show. After beating the boss of The Great North, return to her and she will be done with the painting, which will unlock the achievement.
I think this achievement is missable, though I obviously did not test it. If you don't talk to her early in the game (for instance, waiting until free roam after beating the final boss) I'm unsure how the second part of the quest would be triggered where she actually finishes the painting. To be safe, talk to her in town ASAP.