Looks Great, especially for a foam build. I find foam is pretty versatile, so I like to use it all the time, especially for inexpensive costumes that I need done relatively quickly.
As per everyone's concern that spraypaint will eat foam, from all my experience, it does not. I use it in a lot of projects. If you're still concerned, take the spraypaint in question and spray it on a scratch piece while you finish building. Look at it when you're done in a few days, and see if anything happened. If not, you've got the go-ahead!