Dry brushing is a very nice distressed look but is a lot softer than what we do with ink. To dry brush using a paint brush dip your brush into the paint and either with a paint tray or a scrap piece of paper brush away the excess paint so there is very little paint left on the brush then brush along the edges of your page or photo. Very simple yet very effective. I have added an example of a page of a mini book I made for my DD a few years ago as an example. Have a try it can be really fun and have a really nice effect.