I don't think it is fisheye. You're getting a forced perspective out of the net, as it is curved as if the wind is blowing it that way, so because of the upward angle and that curve it appears to be fisheye. If it was fisheye the character proportions would be off as well. This is excellently done though!
I don't think it is fisheye. You're getting a forced perspective out of the net, as it is curved as
