Marvelous finding that old silver half! As to better photos, your camera may have a macro (close-up) setting which will result in a crisper, more detailed photo as long as you don't get TOO close. Photographing outdoors in good light helps too, as will a contrasting color for your background.
Okay, so I'm pretty good with photos, but after a year of detecting and enjoying t-netters' finds, I still haven't figured out how to get my avatar and pics of my finds on t-net, wah! lol. Happy Hunts to you! Andi