I have a painting that is touch-dry and the paint was applied thickly, for effect. It's a very dark painting. The whole surface is glossy and highly reflective. So much that I can't photograph it. I can barely even see it properly in a lit room. No amount of natural light, diffuse light, or very low light will allow me to get a good photo. With the bumpy surface, no arrangement of lights seems to help. It's a challenge.
My thoughts are that I should ignore all this, let it dry completely, and varnish it with a matte varnish to kill a lot of the reflections. Is that thinking correct? Perhaps there are other approaches.