That looks like a fairly complex pattern to have done for your first doily! Great job!
I'm not sure the technique you used to block, but I always hand-wash or at least wet thoroughly my doilies, and then pin on a blocking board starting from the inside and working my way out, stretching as I go. If you don't have a board, I've used ceiling tiles you can get at the hardware store and just covered them with plastic wrap or wax paper. Just be sure to use stainless steel pins not steel-plated so you don't have rust problems.
Here is one of mine before blocking. Not too bad, but there are still some bunches and wrinkles.
And after wet-blocking, it's grown in size by a couple of inches.