I have a painting that I did in Acrylic. I like it but because I used medium the painting is shiny.(particularly when I photograph it) Any suggestions as to what I can use to tone down the shine?
You can mix acrylic matte medium with acrylic gloss varnish/medium - equal amounts should give you a semi gloss effect. You can add more of the matte if the shine is still too much. Add a bit of water to make brushing on a little easier. You can also get spray varnishes in gloss and matte. Spraying with the matte alone will make your painting non-shiny. Liquitex is a product I use.