A shamrock for St. Paddy's Day - a bit early.  JoAnn sent me this because she thought it would be a fun project to paint.  I don't think you need me to do a demo.  Just a few suggestions.  Make sure that your black pen is waterproof.  And this would be a good time to experiment with different greens if you have more than one.  You can use them all, mix some together, use some full strength, some watered down,  play with them.  Have fun!