Who is judging the skill of these sudden savants?

Aside from code, I draw and paint well (art school) and have built my own furniture. I know I am far from an expert.

However to people who's last artistic endeavour was finger painting as a kid, my skills appear expert. I don't think they could tell apart the skill of a real practicing artist vs me, they have no foundation to judge from.

One day I want to take off 3 months, and lose myself in learning to play the piano, 4+ hours a day. I suspect I will be pretty good at the end, but judged as far better a player than I really am!