I usually put my stacked bows on french clips.....not matter what no slip grip method I use alligator clips do NOT stay in my middle DD's hair.
Your pink bow looks good, the top bow looks like it needs shaped, maybe next time go with just a smaller amount of ribbon. You can't really see what is under the pnik striped bow...are there spikes? another bow? Stacked bows can be so much fun, because you can make them any way you want them!