Pics of the overall condition - if there are areas of damage also. Pics of the hardware on the back of the gas boat as well as the motor etc. Pics of the inside of sailboats showing what (if any) electronics are installed.
Make sure the pics are sharp and well lit - blurry or dark pictures raise doubts in the buyers head.

The classified section of this site is - Boats & Subs :: RCUniverse Radio Control Classifieds & Marketplace and the only place where selling can take place here.