I do love the nervous look on a ladies face just before she gets gunged. It doesn't matter if they are a gunge pro or a gunge virgin, the look on their face when they know the mess is coming can be priceless. Here's a selection of a few of my favourites from my own stuff. As well as the nervous anticipation face picture I've also included an after picture...this is the Messy forum after all! Incidentally, all these scenes are available at the link below:
https://vidown.com/cgi/store2.pl?site=messymayhem.com

Feel free to add your own to this thread.

Wow, those are some great photos and reactions!

You have been doing the lords work for a long time

Really wonderful work, Bob! I love seeing the before and after.

Almost all of this, in my biased view, comes down to the comfort someone does/doesn't feel on the set. Some models just aren't interested in gunge at all, so I'd bet getting them to react like this would be nearly impossible.

But if a producer creates an atmosphere where a model can, as much as possible, feel comfortable and enjoy themselves, magic moments like these can happen.

Here's a few fun ones from Wam with Benefits

And of course Tristan

This is a great idea for a thread, Bob. Particular shout-out for Hannah in squirming mode, and Roxy's amazing somehow eager look of nervousness

Some other favourites from your empire attached, Valis/Portia always seemed to have a rather striking look too.

Plus a few other old favourites which come to mind from the odd other classic set, I hope permissible to extend the mess beyond gunge, sticking with the before/after look.

Also interesting by your steer to have to rule out a few wamming legends as they rarely looked nervous, more totally up for it!

This is such a great observation, I love the look of nervous anticipation!

A model giving a nervous glance towards the table of pies that will be be used, or towards the pie deliverer once they've picked up a pie really makes a scene for me.

Similarly, I love when a girl is seated in a gunge tank and gives a nervous look upwards at the gloopy gunge that will soon be covering them from head to toe!

Just want to echo what a few others have said and agree that this is a superb idea for a thread. Wanted to add on a few examples to it, plus the accompanying gunging.

100% correct. The only way playful, and nervous playful anticipatory energy can come out, is with a model that has been made completely comfortable in the environment. She's gotta be ready to take the ride. The ones who in any way are not comfortable don't let out this level of genuine expression.