Your quilt is beautiful. Your quilting makes your flower pop. Give yourself some slack. We learn a little at a time. I just meandered for years. Then I took a deep breath and started doing more designs. The trick is to practice them on paper first. you can even take plastic and put it over a design and draw and redraw it with an erasable marker. There are great DVD's out there and also craftsy.com quilting classes along with other sites if you cannot get to or don't have a local quilting shop. What ever path you chose, keep in mind, it is one step at a time.
Also remember people look at your quilt as a whole. And the overall effect of your quilt is just wonderful. It doesn't have to have any more advanced quilting to be beautiful