Using tooling effects rarely gives it the ' proper' look of genuine PixelArt. I am guessing you used the spray paint tool. This is not something used for PixelArt as the vast majority of pixels should be laid on an individual basis.
Your light source is not correct, it should be from one side and from above, not just from the top.
The heavy grey and white lines around the edge put the piece out of balance.
Computer generated type should
never be used in PixelArt.
What you have made here is a digital drawing but not PixelArt. Here is a guide for PixelArt.
[link]I am moving your work to Digital Art > Drawings and hope what I have said will explain why it is being moved.
