Lets think of a way to not look just like pot and dope with only a cannabis leaf.
Is there a way to combine the cannabis leaf with the products that define hemp( oils, building materials/fibers, cloth, rope )?
Great work ! I like coin logo designers

That was my original goal, just couldn't find the appropriate images that would define hemp AND work on a small scale. People weren't enjoying just the medical side of it so I went to the leaf but I agree. I'll get back to it later tonight, just going to wait on more feedback.
I do not think hemp really has a defining image. Maybe if you included the stalk of the plant and had the leaf smaller. Just an H might work. I have no idea.
I like these coins:
If you design both sides I can animate the coin in flash and convert it into an animated gifI think it is important to keep a little bit of the marijuana aspect to the coin just to draw in that audience. Have a secretive connection to marijuana while overall being hemp.
If you want to put a persons face on the back this guy is a good choice:
http://en.wikipedia.org/wiki/Marc_Emery although he is more marijuana than hemp.