I am often a decider in items if they make it to me. (To make it to me, art has to pass it for poly limit, and other art technicalities)
In my opinion, screen shot paintings are OKAY with ONE major caveat. I do not want a screenshot.
I want something that looks like it was done with oil paint (or some equivalent medium)
So I would want a "filter" run over the image to make it look like a watercolor... or oil painting, etc. I think you get the idea.