Elsa the Snow Queen (Frozen)

Practicing with Elsa
I'm really having trouble drawing eyebrows and finding the right "size" for my outlines...
If you've got some tricks on figuring out how thick your outlines should be or how to improve them generally,
I'd be happy to hear it ^o^ Thanks!

Brush used: elric888.deviantart.com/art/Sn… Thank you!