Snapper cydia tweak allows you to pin screenshots on the screen.
Have you ever switched between two apps, maybe you took a picture of a WIFI password that you need to enter. With Snapper this is made super easy! All you do is: open snapper (with an activator action) and select the area you want to keep on-screen, that’s it! The area will stay on you screen until you decide to take it away.
You can also save and/or copy the “snaps”.