Yes, I know those wonderfull works. They are very inspirational indeed.
I saw Iwashige-san small vignettes in Hobby Japan Military Modelling Manuals Magazine not long ago. You are right. The Maruken painting style is very effective there.
I think the effect in your car is fine, but I think it will be good to add more effects and details.
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Please take a look at those images of a Staff Car one good friend and excellent modeller is making. I think this works is also very inspirational, deshou?.
His name is Joaquin Garcia Gazquez and maybe you know him because his works are featured in Japan on Master Modelers Magazine recently.
Hope this helps.
PS: Please do not forget a valid email account on your postings.