Repeat this process until the photo gets to the size you desire. The sharpening intensity should be reduced each time. If the photo is very small, I reduce in increments of 25 DPI instead of 50 and stop reducing at about 200 DPI or when the height or width is to my liking. If the photo is very large, I may get to 100 DPI and still have a photo larger than what I desire. Don't be confused by the size of the photo.
Display size is contingent on the dots per inch of the scan.
Your graphics program should have a button that will give you a true reading on the display size of the photo. Use that as a guide to your desired results. If you add text first, reduction and sharpening features will destroy the clarity of the text. When finished, save in JPG format. If there is more than one person in the photo, I use the oldest person in the photo, even if it is a spouse of an Inman.