this w123 auction history page has a nice graph showing sale prices (or reserve not met numbers)
You can hover over each dot to see the vehicle - most of the high ones are wagons (surprise) - but this should give you an indication of where the market there is. I think your car looks like it would do very well. your photos are pretty nice, but I'd even consider plopping down a couple hundred for a pro to take a bunch of flattering pics. the auctions that are well presented and where the seller responds to the questions in the comments - do the best. Most everybody agrees that nice photos always end up having a good return on investment.
https://bringatrailer.com/mercedes-benz/w123/