You did a great job! It's your first time you do handquilting and with practicing you will improve. Of course it is also a matter of the material and flannel on the back of your quilt is not so easy to handle!
So take your time, go on with it and you will see your skills will improve.
Hand quilting is like hand writing - we all have our own way to do it and it always looks different. It is a very personal thing.