Great to see you join in with the challenge! I look forward to see how this progresses!
As for the shattered texture. Do you mean when you add the texture from 123D Sculpt+ it looks like a jigsaw puzzle? If so then this is how the texture is generated and exported from Sculpt+. It is usually called an atlas UV map. It can be very difficult to edit in another 2d art program. See the Halloween Challenge for a comment from me on a workaround for this problem. Once you get use to doing it this way it becomes easy. Sort of!
I always export Using the obj file option. Your model looks Okay to me. But sometimes models may not load correctly and the webpage may need to be refreshed. If it happens again try and take a screen grab.