Took my varanus approach and did a speedpaint (app. 45 minutes) of a Plateosaurus skull (largely a tracing from a still from the Loewentor video) and subsequent paintover. Some of my thoughts while doodling:

• dorsal scutes; seems of later sauropods had large, triangular scutes down their spine, the prosauropods would likely have them too.
• lips; the ridge and pinhole artifices (man, my vocabulary is rock solid!) indicate soft tissue. I went for lizard-like lips here… no muscular attachments, no closing in cheeks. I suspect that they had very capable tongue musculature which wolfed in vegetation… not happy with my solution yet. In contrast, the Kentrosaurus will have no lips, and more of a lower chin shovel to keep the vegetation from spilling out
• throat tissues; I think there could well have been impressive display mechanisms about the throat, like Brian Engh‘s but differently shaped. Not inflatable either, but Anole-like or possibly diverted from the beefy tongue
• nostril; I’ll have to pursue the bulging chamber more. It hardly comes across in this sketch. There is an edged depression that looks like the monitor lizard’s, and I like the idea of a rigid, chamber there with the nostril opening itself more forward. No soft baloony stuff though. That seems suspiciously like a strangulation bag for a beast that would suck in a respectable volume of air every few minutes
• only alluding to skin structure and coloration. No real exploration here yet.

That’s it. Off to the races.