These are not my hands.
Image credit: CrossFit
But at our gym, a few people's hands look like this. Holding the weightlifting bars, the pull-up bar, and the rings will give you calluses after just a few days. I didn't want mine to rip, so I looked up some info about it. Wow. There was lots of info and advice about calluses--one person even uses a Dremel to file hers off! Another guy had this whole spiel about soaking your hands and scraping them with a butter knife. Gross and time consuming. I thought I'd just take a page from my running days. (That made it sound like they are over--I've got to do some more running!)
Lots of running will give you calluses on your feet. If you don't file them off, they get too thick and can rip or cause deep blisters. Same thing with calluses on your hands. I used to file down the calluses on my feet with a pumice stone in the shower and put lotion on afterwards. I've done the same thing with my hands, and it has worked well. Orange and Ginger Bath and Body lotion to be precise. It smells so naiice.
Anyway, you don't want to file your calluses right off or they will be too tender to grip the bar. You have to keep a little callus-ness. If you are a hand model, I don't know what to tell you. You might have to try some fancy gloves or something.