My pictures are pretty crappy so take my advice with a grain of salt, but you could try increasing the exposure time a bit. You're using 1/80 and 1/100 which is faster than you really need. You can still take pretty good shots at 1/20-1/40 while holding the camera as long as the snake is cooperating and sitting still. You can mess with the setting quite a bit more if you're using a tripod.
Also, don't be afraid to photoshop them a bit.
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