Make sure *each* of your posts has a hash tag on it.

THERE ARE NO BOOSTING OR DE-BOOSTING ALGOS!

so you need to post, interact and use hash tags.

For your work #artstr should be on most of them, also #paintings #art would be good.

Without hash tags no one will find you.  Follow other artists and see what tags they use.

Follow back. Also for questions use #asknostr as there are active users that follow that.