Unfortunately those electronic watermarks can be removed by someone sufficiently knowledgeable. I've chanced upon pirated copies of a few RPG products from the OneBookShelf sites (Wargame Vault, et al.) where they've been taken off; obvious, as the digital products aren't available anywhere else.

Might be worth saying that this is a free-to-access resource as well (perhaps add it to the Free Symbols & Artwork topic @Monsen?).

It would be interesting to know how it complements the existing Heraldic Symbols pack from the March 2008 Cartographer's Annual too.

I think the point is a token on a map is usually something that can be moved, because many people will be familiar with their use in online RPGs, for instance. It's not quite the same as one of the monster or character top-down miniatures in some of the DD3 symbol sets, which are complete items, the same as, say, a piece of furniture. The Token Treasury items don't look like they "belong" on a map in the same way. Personally, I think the TT items can look good as mapside or border decorations, by preference, though I could see some might also be usable as floor decoration, probably with a suitable Effect applied.

Actually, any colour version can be readily converted to greyscale simply by applying an appropriate RGB Matrix Process Effect to the whole map, so that would be win-win!

It's pretty much standard practice in a lot of real-world cross-sectional mapping to vary the line direction like this, often to follow a specific passageway, or series of linked passages and caves. The purpose of the cross-section is to provide useful detail that's not so easy to identify on the plan-view map, so any line that works best to show that is appropriate.

Indeed, if you take a look at the PDF mapping guide for CA7, Caves and Caverns, this is exactly what Ralf (I think?) did in drawing the sample cross-section for that cave using the modern cave mapping style.

Sometimes, it may even be helpful to use more than one such cross-section.

Looking at the cross-section on your first map above here, while it's interesting, in pointing out how variable the levels are in different parts of the cave system, it's not all that helpful, since it implies other parts of the caves may be at similarly variant levels, without indicating what those may be.

In some cases this may be of merely academic interest, where caves aren't directly linked to one another and are some considerable horizontal distance apart, for example. However, where the passages and adjoining caves are at different vertical levels, it can be much more important - i.e. if a passage enters in the ceiling of the next cave, say.

It may also be useful to add some cross-sections of individual passage segments next to the area on the main plan view too. For instance, there are a couple of clear choke-points towards the SE end of the narrow, SE passageway. This suggests they're more or less impassable, yet there's a mapped cave beyond them, so there must be a way through, if perhaps only a crawl-space. A cross-section of just the choke-points on that passage next to the narrowest parts would help clarify that.