Very nicely done! You have a very cute style that's developing here! I can't wait to see the lined and colored piece!
Just some tips in general for any growing artist really, is to study some photographs of your subject and use lots of references; that will provide you with great form and anatomy! You may also want to consider watching other people draw as well (I recommend watching speedpaints!) since you can expose yourself to various techniques that other artists use. Then, you can learn and develop your own techniques and styles that work for you<3
Keep up the great work! And of course, practice, practice, practice! c: