[Franek Grabowski]

I am afraid I have not seen anything from the German side analysing enemy's camouflage and in general, accounts from the Channel Front are scarce.
Anyway, a comment from a pal flying warbirds is that camouflage is effective indeed, regardless of what one may think. If it was not, nobody would bother.
The approach was different in various countries but most adopted various disruptive patterns which not only concealed aircraft against background but also made difficult to work out silhouete.