I finally got up the nerve and posted some Art cards on EBay the other night. I'm patiently, impatiently waiting to see if someone bids on at least one of them. They are all of Madonna and Child images which I hope will spark someone to buy for Christmas presents.
They were more of a last minute deal to see if the format, which is very small would be of interest to me (they are always 2.5" x 3.5"). I did find it a challenge but it wasn't too bad. All of them are reproductions of mostly Raphael images, so it was also an exercise in drawing.
I think I'd do it on different paper using different pencils.
I'm really not a fan of the Prismacolors. I feel like the only one out there that doesn't just love them! Reasons why I don't like them... too waxy, they seem to crumble too much, especially when I was using the bristol board. layering also seems to be harder to do for that reason. They don't have the dry feel like the oil based ones (which escape me right now, and I'm too lazy to get up to see what the name is right now!) I think that's what I hate the most.
I did make a significant investment in Prismacolors before finding the other ones which shall remain nameless right now. I regret doing that now. I'll use them up eventually. Good thing they never go bad. I have pencils from college I'm still using, and that's been nearly 20 years now.