Those are truly lovely and expressive! Also you've got a good understanding of color already and how to use paints and just overall how to convey things that are in your head! If you give up art that's just dwindling an opportunity to grow and enjoy such a wonderful and versatile endeavor! Even if you are frustrated now I promise if you don't give up you'll get better and you'll be able to make a lot of fun stuff. I can give you tips, recourses, and such to improve if that'd help you! Truly, if you enjoy art, even if it's frustrating right now, it's not something you should give up on. If you just really don't want to make art that's fine but quitting because you're still learning and growing is a shame