If you want to use your walking foot, you will need to take a few stitches, drop your needle down, turn your piece, take a few stitches, drop your needle down, take a few stitches..... all around the curved designs. Trying to turn your fabric without doing this will probably cause puckers.
This may be an excellent time to drop your feed dogs, get out your darning/FMQ foot and give FMQ a try :D:D:D