I had a few ~6"-7"-ers, total length, but no pics, sorry. They do not look as cute as the younger fish and also appear to lose a lot of their inquisitiveness. The colors and the contrast wears out.
IME, adult Pimelodus pictus cats are surprisingly less hardy than the younger guys. IDK how general this is (I hope people will either confirm or disprove), but IME I have had trouble with several of them I picked up from various LFSs through the years. They had difficulties acclimating, some did not make it while 3"-ers have shown no problems at all.
Let us know how you get on with your guy, please.