Without Ambitions:
A*: Master the painting skill. Then complete all of the skill challenges of that skill.
A: Master the painting skill. Then complete most of the skill challenges of that skill.
A-: Master the painting skill. Then complete some of the skill challenges of that skill.
B+: Master the painting skill. Then complete one of the skill challenges of that skill.
B: Master the painting skill but only reach level 9 in the charisma skill.
B-: Master the painting skill.
C+: Reach level 9 in the painting skill.
C: Reach level 8 in the painting skill.
C-: Reach level 7 in the painting skill.
D+: Reach level 6 in the painting skill.
D: Reach level 5 in the painting skill.
D-: Reach level 4 in the painting skill.
F: Reach level 3 in the painting skill or less.
A: Master the painting skill. Then complete most of the skill challenges of that skill.
A-: Master the painting skill. Then complete some of the skill challenges of that skill.
B+: Master the painting skill. Then complete one of the skill challenges of that skill.
B: Master the painting skill but only reach level 9 in the charisma skill.
B-: Master the painting skill.
C+: Reach level 9 in the painting skill.
C: Reach level 8 in the painting skill.
C-: Reach level 7 in the painting skill.
D+: Reach level 6 in the painting skill.
D: Reach level 5 in the painting skill.
D-: Reach level 4 in the painting skill.
F: Reach level 3 in the painting skill or less.