What do you call this type of elevator?

See picture -- is there a better term than glass elevator?

[I used to work in an elevator company]

We usually referred to these as "panoramic elevators". (Google returns a few hundred thousand hits on this).

Observation elevator or sightseeing elevator.

I think observation elevator is more commonly used, as Google returns pictures and more results (76 thousand vs. 44 thousand, with quotes).

It depends on whether you are referring to the glass-ness of them, or the 'inside-out-ness', in which case you could say 'external elevator', though I've no idea if that's the 'official' term.

Yes, in some parts of the anglosphere, "glass lift" (or indeed panoramic lift) is a better term :-)