I use several different magnifying glasses ranging from 6" to 2" diameter, I buy them on ebay whenever I forget and leave one behind
I have done landscapes but I tend to do more wildhorses, Elvis, Marilyn, and I could of course do a trailer. I get a lot of requests for hot rods, pets, and copies of tattoo's.
I do not sell at craft fairs, but it could be done of coarse.