Questions if you would. What kind of illustration boards do you use? Looks like your more recent paintings are not on illustration board, why the change? And do/did you prime the boards before use with anything? AND (lot of questions haha) do you put them on illustration boards when you're just going to scan them in to be printed in another medium? Like this painting is the cover for something else. Or could you also sell the paintings you made on illustration board in their original form as well, or is it just for scanning purposes?
Yes, I rarely use illustration board anymore. When I did, I preferred Strathmore 500 series heavyweight (20ply) velum finish with several very thin coats of gesso to prime. The advantage to illo board is that it is light weight, stores fairly easily (though is more vulnerable than heavier panels), and can easily be cut to size with a razor blade. I also liked the feel of the surface, which was very absorbent and grabby. I switched for two reasons. One reason was that it didn't feel as substantial as wood panels when it came to the original, and the second reason was that I've since changed my process and the new process feels more natural and appropriate on a harder surface that is slightly less absorbent. Generally the surface has nothing to do with if the piece is for reproduction, though it might have to do with if the piece is for a gallery or to be displayed as an original (either one reproduces just fine, but the panels maybe look better in person)