Well, you can't. You can never be sure. But are there any people whose opinion you really value? ask them. Also. When a song is finished, let it go for a while. don't listen to your songs, night after night, cause then you grow to love them, and you dont think with a clear head. Leave your almost finished songs for a while, and work on the more rough ones, then, try to think of a ideal song set for the EP. Do they match? Do you think they represent you? Your idea about music and who you are? Have you come up with an EP title? There's many things you can do, appart from getting sucked in the mill of any DAW, which will never actually end. If you only have 30 minutes to spend on your music, don't go to the music software. Try to google some labels, think of your artwork, socialize on the net with bands or artists that are similar to what you do. This is also work on your project. And a final thing. My MMUS teacher once told me, If you have your songs ready, with the best production ever, and you are commited to that, and you spend all your energy on this, and you practice, and you're doing your best, without spending time and effort on your promotion, is like having an infant, that you carried in you for 9 months, feeding it till it gets to walk and talk, and then locking it up , in a basement with no light or air, making sure you drop in to feed it, daily ( this is your 30 minutes, per say). You have to spend equal time on your promotion, as well. Believe it or not, this will clear your head on what to release, after all, and it might get you some important helpfull hands along the way.
hope I helped.. be strong, and carry on. It's a difficult thing, but you will make it, so be proud of you.
Lia Hide is a singer-songwriter, producer, music educator, and multi-instrumentalist. Her debut album was released by EMI, she then decided become an independent artist, besides that she wrote music for a Greek theatre. Lia performed in major festivals worldwide alongside acts like Tricky, Molly Nilson or Kovacs. She also studied piano, opera, musical theatre and popular music vocals, and songwriting and has been teaching these subjects since 2002.