Hi Hoth
I think your camouflage green is a bit on the dark side. If you are adventurous, you might consider finishing one of them just to see how it turns out when completed. Certainly a flat coat on the model will help and a wash will help blend things together a bit and give the vehicle a better weathered look.
I do recommend lightening the two camouflage colors a bit. I think it will keep things from looking too stark. As I have said before in regards to painting - there is no absolute right way or wrong way to do things but some things just end up looking better. This is true for color choices as we are looking for that perfect "Russian" green, U.S. Olive Drab, or in this case Dunkelgelb with the camo applied over it.
For myself, I use Humbrol enamels. For the last 30 years or so, I use Humbrol #83 Dark Yellow as my base coat for my later WWII Germans. I use #86 German Light Olive as my green color and #160 German Camouflage Red Brown as my other two colors. I do lighten all of these a bit with #34 Matt White to make them look more in scale with the models. Other paint manufacturers usually have similar colors so please feel free to use whatever suits your taste.
I also use a very dark brown wash over my German camo as well. This helps blend the colors. Being an old school guy, I used the basic GHQ formula of about 1 part paint to either 4 or 7 parts artists turpentine to allow it to flow into the cracks and crevices. I then take clear turpentine and a brush and go over it again a time or two or three to get the wash off of the raised details and into the recessed areas. Once I am completely happy with the look, I then will hit some of the raised areas with a slightly lighter color to make things pop even more. The turpentine will allow you to work with the wash for a long time, hours or even days before it sets.
Once I am done with the wash, I set the wash by baking in my handy toaster oven for 20 minutes at 200 degrees.
Here are a few pictures of my late WWII German vehicles.
You can see more on my own thread - "Pete's Place" here on the GHQ Forum. I will be posting some WIP pictures of my WWII German half tracks and some other things soon.
I hope this helps.