Well, the literal translation is certainly tempting, but as I always get a bit stuck witht his one myself, I got curious and checked with OED. Surprise, surprise, look what I found:

museography
The systematic description of the contents of museums. Also = museology

Now I think we'd all agree that here we are not talking about 'systematic description' so much as 'good presentation':

museology
The science or practice of organizing and managing museums.

Now it seems to me that, although the -ography version CAN also mean this, it would be much better to use the unambiguous -ology term --- and moreover, at least that way it doesn't look like one is being lazy!

As for 'scénographe', I tend to think of 'scenic artist' more in terms of someone who paints backcloths for a theatre [artist = painter], whereas here I see it as being something quite specific; more of a 'window-dressing' kind of rôle, wouldn't you say? I'd like to suggest perhaps 'display artist' as an alternative?