A "painting session" refers to a dedicated period of time set aside for painting. It is when someone engages in the activity of creating art using paint, brushes, and an appropriate surface. Full definition
We played with chalk paint and milk paint in the advanced painting session. (findingsilverpennies.com)
But those nail painting sessions often ended in tears. (sciencemag.org)
The class will also include short lectures, instructor demonstrations, extended painting sessions, and personalized critique of the work produced, with suggestions for future practice. (vasaripaintpov.com)