Your lines are strong and nice. Most of the things you draw seem to have definite shape, too (not quivering, which is awesome XD!)
Some errors I see:
- Her left eye needs some correction: top curve (the one with eyelashes) should be longer than the bottom one [You did this perfectly with her right eye

]
- Hair's okay, but it could use a little smoothing, especially that strand of hair that sticks out to her right. It's a little angular. Drawing it with one smooth curve without lifting the pencil much will do.
- The chain connected to the cross needs to be of the same size.
- The left and right sides of the cross should be of the same length.
It's understandable how things easily go out of proportions because you're drawing this in a big size in your sketchbook (Yay! I'm happy to see people keeping sketchbooks

!!). But really, you're better than me when I was your age

! You really have the potential to draw awesome manga/anime style art

Hmm... I wonder if you have any OCs... (original characters [your own charas which you create by yourself])
