QUOTE(kat the cobbler @ Apr 22 2008, 09:37 PM)

I get the composition bit. The bit I don't get is what you have to put in to show that you've considered what instrument it's for. Like for example, the one i attempted was for the flute so i know to include trills. But what do I include for trumpets etc.
If you don't know then don't put anything in.
Likewise bowing indications if you are not a string player.
Keep it reasonably simple you don't need any fancy stuff and unless you can use it effectively (and in 8 bars there's little room for much anyway) it won't get you extra marks.
The main consideration instrument wise is the range of the instrument. It's not necessary to go any deeper than that.
Some instrument specific markings if well used could turn a good effort into an excellent one but won't rescue something that is otherwise not sound.