SS-23; Weathering started

Well once again this thing is fighting me and probably will to the bitter end, this time its the weathering. I'm trying to use washes and effects but these have all left tide-marks so I'm going 'old school' with the use of pastel chalks and spraying the dust on with Tamiya XF-57 Buff then using a mix of Tamiya Earth and Black, Pigment powders will be used to build up the dirt deposits but for now this is where I am;