Hi Madeleine,
You can mix the acrylic paint and resin together for any and all layers. Use no more than 1 part paint to 10 parts mixed resin as the resin may cure soft or may not cure at all. You can use the same basic concepts as you do with acrylic pouring, but the results may not be the same. You could also do an acrylic pour, then cover with clear resin once dry.
As for artwork resins, the Resin Obsession artwork resin works great. You can buy it in our store here: https://shop.resinobsession.com/collections/resin/resin-obsession-artwork-resin
Good luck!