Did you identify the need to fill the nail holes on walk through and provide the tenant with the ability to remedy themselves?
Frankly, if you’re going to be looking to charge for the normal nail holes from hanging pictures, you shouldn’t be renting a place out unfurnished. It’s unrealistic to expect people to leave the walls sitting bare and short of big holes and meaningful repair work, the cost of having a tenant turnover.
Piddly *ss stuff like this is why so many renters, IMHO are just uncaring SOBs when leaving. They assume you’re going to grab every penny you can from the security deposit so they might as well leave the work for you.
Seriously, a foam touch up brush from home depot is 39 cents, a little 8 ounce far of match-paint, something like $2.99 and a small can of spackle is another $2.99 with again, a sub-$1 plastic putty knife to do it and you need about an hour to do them all.
You walk in, squeegee a dab of spackle into the hole and wipe smooth, move to the next hole repeat. When done with the spackle, pick up the pint of paint and the foam brush, shake, step up to the hole, did the corner into the paint, wipe on can lid, dab tiny corner on spackle spot. Move to next nail hole, repeat.
Or hire a handy man and turn it into a $100-$200 “job”.