Sometimes keeping the instrumentation accurate, but the actual compositions simple is key to a good score in unfamiliar territory. The Discovery Sounds “real world” libraries also have some authentic clips that are good to borrow ideas from in terms of your instrumentation, and the register of each instrument.
You are already aware of the harmonic characteristics, but when you listen to your reference music take special note to the cadences that pop up.. I find that there are normally two or three types of cadences that are more commonly used per style of music.
if you find the right cadences and types of chord structures, the key notes that make up their scales, the instrumentation and register of each instrument and you take in account the variety of moods that are needed and the time the film is set in, it will be very hard not to have something to be proud of.
But it really depends on the projects brief. I did an Egyptian piece called “dream scape” that had to be a modern piece with a hint of the traditional sound, so instead of authentic instrumentation I used modern instruments like the acoustic guitar, bass, and kit with a few orchestral cymbals and gongs.. but purely because of the scales I used it sounded rather Egyptian/middle eastern. You can hear it here:MySpace.com - The Music of Dylan Ellis - Johannesburg - Other / Visual / Experimental - www.myspace.com/dylanellismusic
My track is in a song structure that was key a specific scene, this peice isnt a traditional score.
Hope that helps?