I think your pin washes are very well done and conservative.
I think you may have had the flash on a few photos (or a bright white light). Anyways I know lighting is everything for colors. That said, it seems there may be a little to much drybrushing / antiquing.
I like to call it "antiquing" because that is exactly what drybrushing does. It makes things look old. If it is done too much, it can make the model look like old furniture. I think there is a lot of silver in your drybrushing as well.
I would recommend drybrushing only a very faint shade lighter than the base color. Then, use a pencil on any of the sharp edges. This really helps to divide the model for the eye. Only use silver for drybrushing very sparingly!
Overall, your model looks awsome! To my eye, a little more refined lines (via less silver drybrushing) will really help to show the contours of the vehicles (espcially dark colors like your panzer is wearing). Keep on keeping on. This panzer IV is a very good model