yeah I when I do copy-pasting I can either go back to the panel I know that certain picture is in and just copy paste from there, or something I started to do which has been really helpful is I make a file that has all of the times I used one person in it. So that way I can see "have I drawn this face before?" look at my superfile, and either use a picture I've already drawn as a base, or just copy paste. So like here's one I have of a character
Looks small but each image is about 8 inches wide, so it's easy to select an image, copy, and then paste. Also it's been helping me stay more on-model, which is nice.