1. Shapes. and lines. Everything is rough and bricky. This is more of a wip than a complete drawing. It looks like you rushed everything and just scribbled as bit. Try smoothing it out and getting more of a human like figure.
2. The colors are really bad. I mean really bad. Try blending a bit and getting colors to transition from different shades better, it would help.
3. Again, proportions are really bad. Huge upper body and tiny tiny kid like legs. The head is also badly proportioned. Try looking at other cartoonish drawings of humans and try to find how they proportioned it.
4. Details are bleh. The hair looks like it was done in a few seconds. Hands are super blurry and fucked up. They eyes aren't even finished lol.
I'll will say you do have some promise, but this needs a lot of work. It looks like you put literally zero effort into it.