a walking foot will not help you quilt around those leaves- a walking foot is good for stitch in the ditch/cross-hatching, ect- straight lines.
a free motion foot (also called a darning foot) is used for free motion quilting.
make a (practice) sandwich about 12" square, put a few leaves on it and practice. free motion quilting takes some practice before it looks good enough for a quilt up for auction.
if you do not have a darning foot do you have a clear foot so you can see where you are going? that would help=
also with a walking foot the feed dogs are kept up- used-
with free motion the feed dogs are put down- not used- which allows you move the fabric sandwich around