I got Monaghan with "Dwarf, male, age 30, brown hair, mustache, carrying bastard sword, smoking pipe, burly, strong, character porttrait, larry elmore, d&d, dungeons & dragons". It didn't pick up on quite everything, but I was really pleased with rhe result.
I think one of the best tips is to include an artist's name whose style you want to emulate, as long as they're of enough notoriety that the app will recognize them.