Not a bad early attempt at all!
The crop is super-duper tight! Most say that chopping off any part of the head is a no-no, some say that the forehead is okay. You never want to chop off a chin as it will cause the face to totally lose proper shape. The chin is funny in this image, but if printed and framed it would be cut off.
You can always crop in post, but you can't always add more to the photo.