How to fix the pupils on the eyes?

[MrNormalDraws]

I got Oliver, but his right pupil has a scratch of paint and I just wanna know what's the best way to fix it? I did thought on sending him to the department to fix, but I don't want to keep sending my engines to there. Plus their shipping department is closed for the rest of the month.

[Titanic5972]

Black paint and a brush.