Ohhhh, it is really a fantastic quilt! I would say the squiggly lines would look fine as would the "flower". You might want to search Izy's older posts..well...from a couple of months ago anyway...she did some "in the ditch" quilting, but used a squiggly line over the "ditch" to do it. It looked great and is a very "forgiving" way to quilt if you are feeling uncomfortable.
I really love the quilt and if it were mine...after all the work, I'm not sure that I wouldn't quilt it very traditionally...diagonals going both ways.
Whichever way you go..you can't go wrong on that beautiful baby! :D