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There is no limitation to the placement of mehendi. The inner-part of the hand is the place where henna stain gets the darkest because it is the most moisture part of the body. Plus this was on a man and the upper-part of the hand is hairy which makes mehendi almost impossible. You can buy good henna from Indi Art Cafe. I would recommend that you order the hand-made cones. Personally, I buy the powder and mix it myself but it takes some practice to master this process :) good luck

Wow! Thank you for the detailed explanation! I have completely forgotten that the hair could be a problem. :D Good luck to you too! :3