A motif of two or more letters, typically a person's initials, usually interwoven or otherwise combined in a decorative design, used as a logo or to identify a personal possession.
I would have to say either valve trombone or baritone/euphonium.
Here ya' go? A really bad doodle brought to you by me. Hope this helps? (Just trace it if you need to, I really don't care)
A posed shot is exactly what it sounds like. It is when you have your model or models pose for a picture. A candid photograph is a much better choice.