Again, nice work. At that scale your diorama setting is obviously fairly large as well...do you have a website? Or, do you know of any websites that might focus on the 'altering' of this large scale medium?
there are many forums about 1:6 figures, etc., I think this is one of the biggest (?): http://www.onesixthwarriors.com/forum/index.php?, or a german one is this: http://www.razyboard.com/system/user_Fubar.html - but there are many more and especially for altering there are many different techniques: some use chalk, oil paint, real dirt...
There you have to try a lot (you can wash the clothes if it dosn´t suggest you!)