Jellyfish are quite beautiful and interesting to look at, I just don't particularly like swimming with them.
This is an illustration I started a very long time ago, and just finished last week. I had difficulty with the background, and I'm still not completely sure about it. I tried seaweed and a few other things, but wasn't quite happy with it. Then I added several other jellyfish, because they are usually found in schools.
And I have a fun free project too! I designed these valentines made with cut paper for Cut Card Stock. You can find my tutorial on their blog.