I'll add a rough coordinate grid drawn on top of the image so it's easier to name which parts of the image we're talking about. (There's so many objects and characters in this image and it's hard to tell which ones are significant that I don't dare to number them individually: I'd surely leave some of them out.)

Mounted objects (upper row)
- A5: unidentified picture
- D1: Vigo painting (Ghostbusters 2)
- F2: Cloud's Buster Sword (Final Fantasy VII)
- G2: unknown painting
- H3: weapon maybe, possibly a mace?
- J3: Majora's Mask from the Zelda videogames of Nintendo
- M3: possibly Luke's green light saber (Star Wars)
- N3: Frostmourne, Arthas's sword from Warcraft III
Mounted objects (head height)
- I4: Han Solo frozen in a carbonite block from Star wars
- K4: Head of a Rancor, creature from Star Wars: Return of the Jedi (see image of real world statue)
- Q4: Deathly Hallows sign
Posters on the columns
- C3: Boba Fett (Star Wars)
- D3: Bossk (Star Wars bounty hunter)
- F4: Tank Girl from the eponymous comic book and film (this one is easy, there's actually a yellow on white text saying "TANK GIRL" above her).
- G4: poster for Barbarella: queen of the Galaxy film (1968)
- H4: One Million Years B.C. (1966 Film)
Characters
- A4: unknown gunman shooting a blaster, visible only as silhouette
- A5: unknown person facing the camera
- D6: Geralt of Rivia, character from Witcher
- E5: unknown floating black sphere or head
- F5: H. P. Lovecraft holding Felis
- G5: Illithid from D&D
- H5: Commander Data from Star Trek TNG
- I6: The protagonist from Journey 2012 video game
- J5: Malcolm Reynolds from Firefly
- L6: Sir Bedivere, from Monty Python and the Holy Grail
- M6: Inigo Montoya from Princess Bride
- N5: Death from Neil Gaiman's The Sandman
- O4: Navi from the Avatar movie
- P5: Angela from Marvel Comics
- R5: A Vault Dweller from Vault #117 (Fallout videogame series)
- S6: Yoda from Star Wars
- T5: bartender, possibly Rachel from Homeworld: Deserts of Kharak; or Jubilee, a mutant from Marvel comics
Table in the middle
- E6: cards of the Gwent collectable card game from the Witcher series, held by Geralt
- F7: unidentified chalice
- G7: Gwent game being played by Geralt and the journeyer
- G6: unidentified flat black object with white icons to the left of the collectible cards
Table in front
- D9: possibly Tom Riddle's diary with a basilisk tooth in it
- K9: d20 dice
- K9: some sort of magic rune circle drawn directly on the table
- Q8: drinking glass
- O7: black songbird, probably one of the storm crows to match the name of the bar
- O9: a Black Lotus from Magic: the Gathering trading card game in a vase (NB. based on Chris Rahn's illustration of the card in the Vintage Masters online-only set, not the more iconic original illustration of Christopher Rush)
Other
- O3 to T2: five more black songbirds
- T6: Finn's helmet from Star Wars: The Force Awakens (notice bloody handprint) on bar counter
(This is a community wiki answer. If you can identify even just one item, feel free to edit it, or leave a comment if you don't have edit privileges.)