Aw...sweet little guy, the hair will grow back. He looks cold and would sunburn. He still cute as ever, just needs a little more hair for confidence
I've cut Zhoie's hair since I brought her home and believe me, I've made quite a few mistakes myself. I leave Zhoie's head/face and legs long and shave her back. In the winter months, it's so cold here, I let her back grow out some though.
Finding him a good reputable groomer will make a world of difference for you both.