I don't really edit the wiki, but Warmaster Seerus doesn't seem like a "mini" boss.
Also, on the visual encyclopedia of creatures, is it just me or is the wolver section's rows out of wack? There is a gap in the second row and there aren't columns of the different wolver variants.
Also on the visual encyclopedia of creatures page, there is no tier two snow drop picture. The scarab variants don't have pictures for their tier 3 forms.
The minimap page needs to be updated with the new UI minimap features as apposed to the old better ones.
-EDIT 12/29/13-
It seems that the obsidian costume lack pictures on their pages.
We may get pictures of missing minis
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-EDIT 1/2/13
Get on that new starter gear and be ready for the gunner update XD
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That's just some things I found derping on the wiki, may come back with more.
I always love to change and edit things related with the monsters of Spiral Knight, i'm a massive wiki editor in that aspect and I can answer you some of your questions:
1- I have to point (although the models exist in the game files) there aren't official appearances of Glop Drops, Scarabs and Dust Bunnies of Tier 1 (normal dust bunnies appear in the Ancient Generator mission only) and I can't take these photos until OOO does some low-ranking mission where they appear. It is forbidden to take pictures from the Spiral Spy. That is why there aren't Tier 1 photos of the Mini-Monsters.
2- I have to update the encyclopedia of creatures some day soon, it is REALLY bugged and some monsters are missing in there, don't worry. I'm going to work in it tomorrow probably.
3- Yeah, i know that there is not tier 2 Snow Drop image, next time that I see a Frozen Compound: Creeping Colony of Tier 2 in arcada, I will take the image :)
If you find more 'bugs' related with the monsters or if something is missing, tell me please.