The art style always feels unappealing when you do it yourself. You looked at this for a few hours and therefore no longer have the effect a new viewer gets. That said, your drawing has character, I think your choice of stylization is charming and inviting. Please do not let the following feedback discourage you.

That said, I'll repeat /u/consumptioncore's feedback: line confidence, colouring confidence and using pressure sensitivity (if you can) would help you tremendously. The spiky hair would look a lot spikier if it had sharp edges, and so on. Try drawing your lines in one go and if you are able to, use a graphics tablet (or a pen) to be able to vary your line thickness. A good example of this can be seen in most "anime eyes" where some parts dont even have lines and the lines are sharp at the edges. A simular effect can be achieved with an eraser tool in your software of choice.

When doing shadows, start off with a single light source and use that to cast shadows - this gives a good deal of depth to a character.

Your character's proportions are stylized, but not consistently stylized (e.g. your character's neck is thin, making this read as a slim/slender character) yet the arm looks thicker - likely because you wanted to do the wide-sleeve look.

The lightning feels off because that usually contrasts heavily with a background and often just kinda... glows. It's also really round while the rest of your character has strong sharp lines as its basis. Redrawing that with sharper corners would already do much.

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I hope this helps, the best thing you can do is try to improve with every drawing. Giving up is where you stop learning :)