Minecraft Seeds

This is a nether fortress in The Nether. I replaced a Blaze mob spawner with a pig spawner, though now I regret it. Did you know? You can give yourself mob spawners with /give "your player's name w/o the quotes" 52 1 98. They will all spawn pigs, sadly.
P.S. This is my first seed to publish. Hope you like it!
P.P.S. Can someone tell me how to take a screenshot in-game? And how to save it to my computer's documents? Thanks!!! Also how do you copy the seed number of a place?

Seed Code: 766145285258577136