If you reduce\disable reflection you will see similar what you want. So reflection at glass is interfere to see color. Maybe you should try to make painted glass as deiiferent material with less reflection
http://imagizer.imageshack.com/img924/5498/2Z3mi4.jpg with less reflection and miltimap color
http://imagizer.imageshack.com/img924/6118/OaKQym.jpg with multisub but reflection is the same, don't know why it's so different.
I find what FOV of camera also slightly change that effect
Sometime i see strange behavior at reflection if i change glossiness to 0.99 render is very different like i change IOR at refraction.
By the way some of your reference image is cg from 3d model market so they can be fake, and some of them have visible gap
http://imagizer.imageshack.com/img921/2861/OMfqbe.jpg
yes, as I said in the previous post i separate the object in 3 parts for have more control of all these aspects, differente reflection refraction for each part i did some test and this is result.
