Does cork bark help keep humidity?Just keep it moderately moist, as long as it has a water bowl and humidity above 70 or so it will do great.
One concern though, that looks like grape wood that you are using. it will mold if its kept in moist substrate. I know other users have talked to you bout cork bark but you really do need it to properly keep a humid arboreal happy and free of mold and rotting wood.