A bit of a retro treat for the fans... some concept art of Japanese Headmaster heads from way back in the mid 80s, that included a lot of potential Headmaster head toys (we only ended up getting 6 produced, and they were released in 1987 in Japan... now commanding hundreds of dollars each on the secondary market).
I think the smaller images were printed in one of the Generations books, but the larger ones look to be new (tweeted from here).
http://www.toycollectors.com.au/news/2018/112801.jpg
http://www.toycollectors.com.au/news/2018/112802.jpg
http://www.toycollectors.com.au/news/2018/112803.jpg
http://www.toycollectors.com.au/news/2018/112804.jpg
http://www.toycollectors.com.au/news/2018/112805.jpg
http://www.toycollectors.com.au/news/2018/112806.jpg
http://www.toycollectors.com.au/news/2018/112807.jpg
http://www.toycollectors.com.au/news/2018/112808.jpg
http://www.toycollectors.com.au/news/2018/112809.jpg