I set up a painters’ group last year; we meet every six weeks or so, taking turns to meet in someone’s studio and look at/discuss their recent work. This morning we found ourselves once again turning someone’s canvases upside down… It’s very transformative, and often brings out a whole new aspect to a painting. It’s something I do a lot in the studio by myself, too, part-way through a piece of work.
So – my main piece of advice to a painter who feels stuck: turn it upside down!