Mine got better with practice.

I usually do mine by hand I just can't seem to get nice circles so I usually do freezer paper applique or ELEANOR bURNS METHOD and hand stitch.I have done a blanket stitch with my walking foot too.By the way your dresden looks wonderful!

when stitching in a circle you need to slow down, and every few stitches stop with the needle down pivot just a little and continue to get a nice smooth arc. your practice piece just looks like you were going too fast. sometimes we have to slow down to speed up. a medium gray thread blends well when using it on scrappy quilts. hand stitching them is 'neater' at first, but with practice you can get them looking as good. an invisible hem stitch works well for this too, or a little (short) blanket stitch.

Gosh what a nice job! I love all of the colors you used.

Lovely fabric, like it very much.

I like it great colours. well done as far as the satin stitch try the blanket stitch it is more forgiving, and I agree with some of the others practice makes perfect :)

Do you have a buttonhole stitch on your machine? I just made a Dresden Plate quilt and used that stitch for all of my applique (just set it to a shorter stitch length), and it worked great.

First thing is to use a stabilizer on the back. Paper will work, just pin it to the block.
Next, try to gently turn your block as you stitch and go slowly. If you need to pivot, stop with you needle down on the outside of the curve, lift the pressure foot, and turn the block so that the stitch will be at a 90 degree angle to the edge. On a sharp curve, you might need to do this every couple of stitches. On a larger curve, you might not need to do it at all.

Love your fabrics. I never put my feed dogs down for satin stitch, I would shorten the width and length though and use a thread that closely matches whatever color the center is. What I do for circles is I hand baste near the edges of the fabric, then it's covered up by the satin stitching. It takes a little more time to go in a circle, so I think just practicing you'll get better. I have also decided that I like the blanket stitch better than the satin stitch, but that's my opinion.

Your fabric is SO beautiful!