I noticed several posts mentioning Chris Foss artworks for Sci-Fi, but it seems that not many are familiar with his work.
I believe his artworks can inspire ALL What If members to think more out of the box.
First time I saw Chris Foss art was back in the 60's. Most Sci-Fi movie models were inspired by Chris Foss artworks.
http://www.scified.com/news/christopher-f-foss (http://www.scified.com/news/christopher-f-foss)
For a glimpse of his artworks, visit this link...
https://www.google.com.au/search?q=Chris+Foss+Hardware&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwiz7Iji2I7TAhXEWbwKHdDcAqEQsAQILQ&biw=1600&bih=794#tbm=isch&q=Chris+Foss+artworks&* (https://www.google.com.au/search?q=Chris+Foss+Hardware&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwiz7Iji2I7TAhXEWbwKHdDcAqEQsAQILQ&biw=1600&bih=794#tbm=isch&q=Chris+Foss+artworks&*)
The book HARDWARE contains all his artworks and sketches.
https://www.amazon.com/Hardware-Definitive-Works-Chris-Foss/dp/1848566980 (https://www.amazon.com/Hardware-Definitive-Works-Chris-Foss/dp/1848566980)
You can see how he develops his ideas from scratch.
Also there is many examples of backgrounds for What If sci-fi modelers. A close look at them can reveal many secrets to those great looking effects. IMHO