How can I retrieve pictures from water damaged device?

basshunter, unless you get to fix your iPhone, there is really not a chance for aDIY'er to get anything from the memory IC's. Rice is great first aid but does not prevent corrosion or any other failure. The very first thing that you want to do, is to stop plugging your phone in, or trying to start it. Disassemble your phone using this guide. Clean everything with a high grade isopropyl alcohol, do not forget the connectors. Use a soft brush to clean it with as well. This guide shows you how to clean an iPhone. It was written for a 3G but it is still pertinent to cleaning yours. Check for any missing, burned, or otherwise damaged components. Once cleaned, replace the battery. Remember that the batteries are smart batteries, they do a lot more than just store energy:-) Re-assemble your phone and re-evaluate for further, if any, damage. Hope this helps, good luck.