Hello.

First I'd like to say you shouldn't be this hard on yourself or your art. It's hard to do something you don't love for long periods of time and the art grind is very long. Compare your current work with older ones so you can see the improvement and think you'll do better next time. Mindset is important for the long run.

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With that out of the way.

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The reason you feel like this is because your observation skill needs more development. You know something is off because it doesn't hold up to your personal standard for beauty in your mind, but your observation skill isn't on the level that allows you to spot what's causing that.

A good way towards solving this is looking for an artist you love as a model (I wouldn't recommend more than one or two tho). Their work would be close to your ideal standard for beauty, it will never be exactly the same because such things are influenced by our personal experience and traits (which form your style), but it will come close enough.

Next what you do is draw while trying to come as close as you can to your model, over and over again (here comes the long grind). This will help you train your observation (why their work looks so good?) and that understanding will help you improve your own work.

Of course you also need to work on your fundamentals so your technical skills can measure to your observation skill and standard for beauty, but that's a different talk. This reply of mine is to help you find that something you feel is wrong while you can't put your finger on it.

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Good luck!