I usually wait a few days before photographing still-wet oil paintings, but like others I don’t post a pic every day to DPW. More like once a week, if I can, with some paintings in reserve that are several weeks old and thus surface-dry. I don’t do anything with them varnish-wise till they are at least six months old; if something sells prior to six months’ age, I might give it a light spray varnish; but have actually sold a few without varnish at all (but let the buyer know…interestingly some folk don’t like varnished paintings).
However, I also do pastels, which don’t need any drying-time…so I can alternate my offerings if I wish to.
The only exception is with the DPW Challenge…so far I’ve had no choice but to offer up wet work, since after the week’s challenge has ended, fewer people tend to view that particular section.
Oils on gessoboard take a while to dry. Oils on canvas similarly. But if using oil-paper, the surface dries faster, due to the absorbent nature of the paper. In my case I’m not getting much in the way of sales anyway, so I will deal with each case individually, if and when the occasion arises.