I need critique for.this vector. I need to know what's wrong with this design and show me the detail

Hi!
Artboard. The top-left corner should be at 0,0. Graphic elements should not extend beyond the artboard boundaries — and this alone can already be a sufficient reason for rejection.

Layers. Everything is on a single layer, which is also rather unhelpfully named “Layer 1.” "Organizing your file - Do: Label your layers." - frome Adobe's "Vector do's and don'ts"

Transparency. You most likely did not create this SVG file in Illustrator, and when it is opened in Illustrator, some of the elements appear to have transparency even though they are shown as Normal, 100%. This looks like a bug, and I don't know how the approval team will react to it. Personally, I would consider this an obvious technical issue with this file.

You could also point out that the solid blue background isn't really necessary, and compositionally the artwork is somewhat weighted toward the bottom. However, those are more matters of your own design choice and are not technical errors as such.

Oh, and if this is a vector artwork based on a photo, you need to be the author of the original image and, as far as I remember, provide it as a model/property release.

But again, incorrectly positioned graphics on the artboard, with elements extending beyond the artboard boundaries, are already sufficient grounds for rejection.

​@ChaChaTry 
1st well done on making the image.I am not sure I would have the patience to do this. It’s fun and cute.
A couple of things:

There are a lot of jagged edges/ sharp edges that could be a more rounded: a job for the curvature tool or pen tool.

Hands are a pain. 

The neck doesn’t complete transition nicely w the face. **I admire the artwork and time you put into this.
Nate

I’m no fan of faceless characters, sorry. I know it’s a popular trend in some circles right now, especially gaming. But to me, it’s a lost opportunity to show your character’s emotional temperature— are they happy, sad, surprised, angry, fearful, confused, excited or disgusted?  Faces tell important stories. Take advantage of them. 

Hope that helps. 

Thanks…

I understand there's still many lessons that i have to learn. I will keep working on better work. 

Evaluating illustrations is extremely difficult.
This is because the "charm" or "character" of an illustration isn't simply a matter of it being "good" because the technique is polished, or "bad" because it looks unskilled.

The motivation to purchase an illustration from Adobe Stock arises when it is of higher quality than what one could draw oneself.
Otherwise, wouldn't it be better to just draw it yourself?
I think you should study illustration further.
Keep up the good work.