stupid grainyness

took this while we were in the pub during class (sounds terrible lol, but we were location shooting and last time i was here the lighting at the windows was really nice, and its quite cosy inside)
but today it was very dull and i had to bump up the iso as i didnt have a tripod with me and it went all horrible nd grainy. been playing around with colour popping aswell, although this isnt a very good example, the fringe was difficult.
hopefully my photos will be a little better in the next few days :)