Ausf. If you want PURE criticism, don't ask us 'sullied' guys.
White wash is very hard to depict right, so congrats on what you have achieved so far. Takes courage to do these.
The side view doesn't show much so I thought I would just say a couple of things that might help, rather than relate to specific aspects of your tiger.
Whitewash was easily removed, and more so on high traffic areas - areas where crew got in and out and where routine maintenace was done. So boots, tools, etc would scuff that area quickly. First to go was the stuff around hatches, etc.
Fuel spills and the like would really show up on the white, a substances that actually absorbed the oily fluids.
Crew climbing tracks would show much higher wear and larger deposits of mud and grime from boots, etc than other areas. The frozen temps and low rainfall prevented a lot of the mud from being washed away.
White wash stayed longest in crevasses and grooves and was worn off in raised areas and areas of large flat planes where the crew walked. The hob nails were murder on the wash.
The only direct thing I could say is that the build up of mud under the guards was extreme in Russia. The amount of mud where the skirt is missing on your kit should be extended all the way a long and especially the rear mud flap which should be coated right up to where the tracks rub past it. If not to be so muddy, maybe remove a bit you have done. The skirt after the missing one would have mud thrown over the forward front as well, if the amount of mud where the skirt is missing is a guide.
Looking forward to more pics when you are happy with your tiger.