It's a copy of X-Men #141's cover from Days of Future Past.
Characters in that poster.
Top Left - Bottom Right
- Cyclops
- Colossus
- Storm
- Nightcrawler
- Angel
- Iceman
- Beast
- Sprite
- Magneto
- Quicksilver
- Jean Grey
- Wolverine
- Forge?
- Polaris
- Havoc
- Banshee
Paulie_D
- 25.5k
- 3
- 107
- 119