DEMAG D7 UPDATE: Adding dirt and dust

So, I am new to dust and dirt, at least making it look good and realistic.  As you all remember, I tried my hand with dust on the SIG 33 and T55, so those were my practice models.  Then the SU-100 was my first "real" attempt at it.  But I am still learning.  So I am going to go light on this model, just cause. 

Here is photo of the dust in the driving area. 

Some more dirt and dust to add and some pigments on gun and done!