You can still use the quilt and enter it in a non judged show. Lots of guilds hold them.
But also use this quilt as a valuable lesson to find out what went wrong on the back and to check your back on the next one. Birds nests are normally caused by not bringing your bobbin thread to the top and holding it when you first start quilting.
Pointy things on the back that are nice rounded circles on the front sound like eyelashing to me, which means you have some tension issues and are probably going a bit too fast. So use these valuable lessons to make your next art quilt the masterpiece you know you are capable of doing that looks wonderful on the front AND the back. ;-)