Well, a lot of panels DO have room for a picture of some kind.
Just as an example, on the late model P-38 Lightning, above the Boost Gauge and Tach, there is a little instruction placard with limitations on Flap deployment, Maneuver Flap Deployment, and Gear Down speeds. A cheesecake photo of a reclining beauty would easily fit there.
There is often an area with the radio callsign printed and of course in CFS, we don't need no stinkin' placards or callsigns, right?
I did a search for the TBD instrument panel and it does look like a very strange one. Bet you can't beat the one on the Blohm & Voss BV-141B for weird though.