I have never mastered machine applique...this looks fantastic. Is it done with the invisible thread? Those are some tight curves to go around..I am impressed.
I ddn't use invisible thread (I try to avoid using it as much as possible), instead I used like colors.
As for going around the curves, my biggest advice is to go slow & shorten your stitch length. If I remember correctly the blanket stitch took forever & I was cursing adding 2 more blocks (original pattern only called for 4 blocks.)