Will using a hair dryer make the photos stick tighter?

No. Stickers can be removed with a hair dryer, and the glue used for sticking photos is difficult to clean, but the softened glue is easy to clean, so you only need to blow the surface of the sticker with warm air with a hair dryer, and then you can easily take off the photos after the glue is blown soft. So the photos won't stick tighter with a hair dryer.