Okay, I have some questions about the digital thermometer. What is that that says 136 on the digital thermometer? I really hope that is not the temperature in the tank, that would be WAY to hot!!! That is an understatement. The hot side should not be much over 90 degrees.
I also suggest actually placing the thermometer ontop of the substrate instead of up on the side of the tank. That way you can get a reading of the floor temps your snake would be experiencing.
And it does look like your humidity is too low. You should try covering the screen top with something. Some people use duct tape, contact paper, or damp towels.
Please let me know about the 136 thing, that's scaring me!!!