Having the large sprouting computer generated arrows right next to the 'hand-drawn' smaller curved arrows has a really chaotic effect, which works well with Pinkie. Then, in contrast to the chaos, you have it mirrored across the picture, showing how even though pinkie is random, she is predictable. The recycle sign around the balloons was a fantastic effect, showing off pinkie's continual urge to party. It feels a tad cluttered, but that fits Pinkie. (If it weren't Pinkie, I would have removed a few of the arrows, and made it a bit less chaotic...) Having two pinkies is a bit odd, but considering the recent episode, it's not so bad. I really like how all the arrows point to a party, even if in a roundabout way. XD
Sorry I don't have more criticism: I think it's perfect!