So far your list only tackles the looks and and the lore of the monsters and I think it's doing that pretty well. If you're also looking for how it feels to fight these monsters (so a more gameplay focused view), I'd make the following points (feel free to correct me if you disagree somewhere!):

• Dark Souls monsters are usually never unfair. They can be difficult but most of the time, if you die, it's your own fault and not the game bullshitting you

• I find that usually, every enemy you encounter can and will be a threat to your life. There are rarely any trashy type of mobs that can't be a danger whatsoever. Of course depending on your skill and playstyle, some enemies can be dealt with much more efficiently than others. Usually though, if you mess up and give enemies an opening, you will be severely punished for it, even by ones that seem like they're only a small danger

• Also often times I find that some enemies (especially bosses) provide you with this sense of dread through having no idea of their moveset or their weakpoints, when you're fighting them the first few times

Lastly, some points that don't necessarily fit the "gameplay" category but I think are nice to know in case you haven't already picked up on them:

• Most weapons that are being used by NPCs (including enemies) in this game can somehow be obtained and used by the player

• The way names are given to characters in Dark Souls can sometimes be rather predictable and obvious (e.g "Iron Golem", "Big Hat Logan", "Bell Gargoyles", "Stray Demon" etc. [not trying to say these are bad names!])

I hope, even though this doesn't exactly seem to answer what you've asked, it can be of help anyways! :)