Need help from one with a steadier Photoshop hand

[The Scyphozoa]

Could someone please make the small things that hang down below the level under the vitals invisible? I want the level field to be just an oval, without the "frills" as I guess you would call them. I've tried but it's hard to make sure you're doing it right, because I can't figure out how to show the actual art while manipulating the alpha channel in photoshop.