I really want to encourage you and help you out, but I have to be honest. that's not a painting, it's just 3 smears of paint. I get what you were going for, a minimalist approach involving the 3 primary colors. but the shapes are not even coherent.
painting involves doing some linework too. getting the basic guidelines for your composition down helps a lot. I've used a projector for this purpose a few times. then you can paint in layers. an underpainting with dark colors, blacks. let that dry, go over it again with brighter colors. it looks great, you'll see. but you need an actual composition to work on!
I hope you're painting still life and stuff in class! Representational work will always be better received. Don't buy into the lies of minimalism and abstraction.
Good luck, don't give up! and remember, art takes time. a lot of time. don't just mess around for ten minutes and call it done. that's just a warmup, and will help you make something better afterward. but it takes time and effort to produce something worthwhile.
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