I've been using glass for almost 20 years with success. There are plenty of tricks to boost humidity. Some have already been mentioned, but I'll echo them based on my experience.
Adding Coco coir substrate will go a long way. I use a blend of Eco Earth and Reptibark. It holds humidity well, spot cleans easily and looks naturalistic.
You've got plenty of room for a second water bowl too. Adding a second water bowl will definitely boost your humidity.
Lastly, I wrap my glass enclosures in 1/2" foam board insulation. I cover the top, back and sides. This helps immensely with heat and humidity control. It reduces air flow while still allowing plenty of oxygen to get in. It also holds heat in. This allows the heating equipment to run more efficiently. Less artificial heat = less evaporation = better humidity.
This also helps to lower my electric bill since equipment is functioning more efficiently.
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