Honestly, this is one of the nicest things anyone has ever said to me on DA. I always wonder if those critiques ever actually help or if I am being too harsh with them. I feel like it's important to be that brutally honest because the art world is meaner than I can ever be, and if it helps in the long run, it's well worth it. That being said, I am happy you are actively looking for ways to improve and take criticism. It's super hard to do and shows that you are serious about doing what you love and having that spark means you will go far eventually. I am no expert and still have tons to improve on, and it took people telling me just how flawed my art was and me finally accepting that to actually improve.
Wed all have habits that are hard to shake off, and if you are only used to drawing from your head and never using reference of doing life drawings, it's really, really hard to make yourself get accustomed to that. Trust me I know. I scrubbed my gallery of drawings that had way more issues than the one I critiqued for you. I checked out your gallery and your recent work, and yes, you have other things to improve upon, but that being said, compared to a few months ago, you have gotten a lot better. Much better anatomy, better use of color, better lighting, and most evident to me, much better, more interesting compositions. You should really be proud of yourself for growing so much.I am so glad I could help you. I don't know what your end goal is with art, but keep pushing yourself like you have been doing and you will achieve great things.