Ahhh this is very nice Moko! It needs a little bit of work but it looks really good so far.

Any strands you have going outside the black lines (those little red wisps), sadly need to all be black. Only official artists making basic items on site are currently allowed to do outside colored linework. (I hope this changes in the future for hair but as of right now is a no go!)

I'd be careful it appears your resizing has made some of the outlines pixelated and too sharp in places that's another nono. Over sharpness in general is something to worry about. All the lines need to be smooth.

The upper buffant area has maybe a few more black lines into it than may be needed to not have the 'sticker' effect though that may be more of a personal preference for myself.

Colors look good and shading seems pretty good you might want a little more highlight but again that could be just personal preference again.

That upper area looks like the side furthest away from the light source could have a more pronounced shadow there instead of a highlight, and the shadow for the lock coming over the shoulder seems to cut off abruptly as it comes over the shoulder so that could perhaps use a smoother transition/taper?

Sometimes too reading through a number of the CW threads (like reasons for denials and things) is super informative and helpful so you don't make the same mistakes. :D

Other than that it looks like a great start to CW making, welcome and good luck in the future with CWs. 8D