That looks like a spider ball python, so the odd head movement is possibly from the neurological issues associated with that morph (all spiders seem to have some degree of a "head wobble"). I've always heard not to use glass tanks outside, because the sun can quickly heat up the entire tank and cook him/her. He/she may be in the water bowl so much because it's too warm. How are you measuring the temps? Also, 75F is a bit too cool for a ball python, and they do best with temps higher than 84F to digest. It would be best if you can get the tank inside, and get the temps to a more ideal range (88-94F for the basking spot and 80-84F for the cool side).
Here's a good guide to help you set up the tank if you can get it inside: http://ball-pythons.net/forums/showt...-With-Pictures!
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