About the color scheme. There was no standard color scheme for prototypes in Soviet Union (every OKB painted them as they wanted), so this seems to be pure fantasy of the artist Yuri Tepsurkaev. I attach here the whole page from No.2 Aviatsiya magazine; you can see that he "painted" different Borovkov/Florov projects in totally different way.
But I personally think that, if the Nazis wouldn't invade Soviet Union and the "D" aircraft prototype would be built and flown in peace time - it could be painted in similar scheme. But most probably it would be red/silver, rather than red/yellow. If the "D" would be built at wartime, most likely it would have upper surfaces painted protective green and lower surfaces painted blue.