Sparkly Heat Transfers

I made these weeks ago with my silhouette cameo, heat transfer and designs from the silhouette store (I added the sparkly spikes per Emily's request). The t-shirts are from Old Navy (the pink one) and the purple one is from KIK a German store here. I got it for $2 euro I think. But it's been a month or so since making them and Ava's Pegasus has started to peel bad from the wash. I guess I didn't iron it good. Boo.