Good job!
I find with curves I do better if I use my whole upper body a bit rather than just trying to do it from my hands/elbows, but may be just me. Give it a try, though. I would suggest that if you are going to work on circles you try smaller ones, at first. Big circles are hard to get round and can be frustrating.
FMQ takes a while, but it comes with practice. Some instructors say to pic one motif and practice it until you can do it in your sleep and then move on. That was my approach and it has worked out OK. I chose Paisley's and I would do an entire fat quarter practice piece worth of paisleys at a time. I would draw them, too. (I quilt a lot better than I draw.)
Keep going and posting your practice stuff.
Watson