Did you spray or brush the paint on the mirror?
The mirror was purchased from Target several years ago, then painted yellow. More info in the comments section here:
downstairs bath, yellow mirror on grey wall
guest/kids bath - fun color mirror?
love the bright mirror...maybe indigo in ours
Add frame around mirror in guest bath painted yellow
I like the funky mirror - not the sink, but I like a bright cheery mirror - maybe for main floor bath
Pop of color for the mirror!
painted the mirror a bright yellow. I am in love with the result".
In the powder room: This sunny mirror is the only burst of color this neutral bathroom needs. The whimsical knobs are the icing in the cake.