I'm not versed in abstracts but it seems to have most, if not all, of the compositional elements in it. I mean the different sized black blobs pull the eye around the image creating a tension and the eye keeps resolving to the big green blob in the middle. Blue and yellow make green so the absence of red can create a bit of tension in the work too. You've got dark medium and light values.
Are you happy with it? If you don't think it looks done it might not be. But sometimes we overwork things when we think about them too much. Maybe leave it alone for a couple of days and come back and take another look. See if it looks more done then.
<insert suitably humorous or philisophical signature here>
Learning when a piece is finished is no small part of being an artists.
You got that right! One of my worse faults....especially when I'm doing flowers is to over work them. It's like there is a bell curve...you go from abstract...to more distinct...to looking good...to getting busy...to a big old mess. It's learning to stop at the looking good stage that is so hard because there is a little gremlin whispering in your ear "Just try adding........ it will look even better" NOT!