I love to see the cool 'picture' or shapes in the finished cabs......but I'm not real comfortable figuring out how to find them.

Especially when some of the things you see on the surface, disappear as you cut and grind and sand and polish.....and other things show up out of 'nowhere'

Any tips??

That's a tough call. Sometimes once you start cabbing it just changes on you. It's a crapshoot. Go with the flow and don't have expectations. I think if you like what you see you minimize the dome so it does not change too much. I was cabbing a piece of Morrisonite, and was seeing a Phoenix fighting a dragon. When I was done the Phoenix was gone, and the dragon had morphed into a mutated seashorse with bug eyes!