Pretty quilt. If it were mine, I would add more in the 6 inch blocks. Personally (and this is my "thing"!) I don't like any sagginess in the block after the quilt is washed. I would do 2 lines down the rail in each block, maybe with a regular stitch instead of the decorative stitch.

If you don't add anything else though, your quilt will be lovely and just fine!

It looks awesome and I would say the quilting indicated will be enough.

It is well within the requirements and looks good to me. I like the pattern.

I agree with the above ......you could run that diagonal all the way across the quilt rather than just the rail squares, if you don't want to stop-start. Since you already have hor/vert lines the bias drag of the diagonal should be controlled and not cause puckers.....I personally think 6" of open space is too much....jmho

I think it's done and lovely.

I would put in a flower like an open rose on each 6" block .

Its nice to have some soft organic quilting on a quilt that is full of straight lines . It its a beautiful quilt.

I like the serpentine stitch. I think it looks great just as it is now.

I was taught by my mom that your space between stitching should not be more than 5 inches.

I think it looks fine as is - love your pattern and the quilting you have done!