Substrate and glass being used for a pygmy viv is totally acceptable and actually recommended!! They need a place to lay eggs, you won't see signs of impending egg laying to move them into a bin so it is very important that a place is always available. Brevs are low forest dwellers, which includes walking around on the ground so this is actually the best recreation of natural habitat we can offer to this type of chameleon. They also need high humidity and don't require so much ventilation as bigger species so glass works very well for them. Be careful giving advice about species you are not familiar with.
It is not actually known if pygmy chams even utilize UVB like other species do so the general consensus is to offer low levels of UVB (a 2.0 or used 5.0 bulb) because it can't hurt and is probably beneficial even if we're not 100% sure. You only need one bulb.
I say your viv looks great! They should be very happy in there!