British photographer Chris Levine just made a pile of money on a portrait of famously anonymous artist Banksy…’s head. The back of his head. The back of his head covered by a hoodie. The portrait sold at Sotheby’s London on Tuesday for a whopping $43,000—about 7 times what Sotheby’s expected. If your first thought is “but is that even Banksy…?” you’re probably not alone. However, Levine is a very well-connected portrait photographer whose other images up for auction Tuesday were…