Welcome to your new hobby, quilting. This is a great first attempt. You probably wont find anyone to criticize your work here. We look, admire, and sometimes share tips and techniques. I recommend you enjoy your first quilt, and know that improvement comes with practice, practice, practice. youtube is filled with visuals on techniques, I found one that might help you:
https://www.youtube.com/watch?v=Dq5DFn6fc6U which is titled " the Best tools to Improve your Quilting Accuracy". Note that one of the downfalls of this hobby is that we tend to be over critical of our own selves and our own work. Don't that discourage you. Mush on. Most of us won't see anything "wrong" with your lovely creations.