The one thing that jumped our at me when looking at he pics was how shiny the wheels looked, are you trying to imitate wet mud? If so you need to mix up a few brown colours and not just one overall colour....and add some substance to yoru mud, either with acrylic resin, or some Mr Surfacer mixed with some pigments.,.....that would help give the wheels a more realistic look.
Other than that, that is a very good Tiger II, and the figures are excellent, well done!
Regards from the Swamp
Hawkeye