There are a few things you should check before you print photos on HP printer. First, make sure that you have select the correct device as default printing device in your computer. The paper loaded in the tray must be of good quality and right size with glossy side facing upwards. The orientation should be set to portrait mode. Let’s see how to print 4X6 photos on HP printer. Go to the app and chose the print photos option. Then you can select the photo you want to print. Chose the size of the photo as 4X6 and click on print.