This illustration of Commander Makara is by Go Nagai and features in the Go Nagai Fan Club Associate Magazine "Makai Tsuushin" (Demon Realm Communications).
The fan club was formed in 1970 and issued a number of publications alongside Makai Tsuushin.
The Makara illustration features in the December 31, 1979 instalment (S54).
You can find a lot more information as well as lots of nice images on this page of the Go Nagai and the World of BBR site (mazingerz.com).
There is something slightly screwy about the JPG image of Makara from the above website.
PHP won't resize it and Photoshop won't open it either, so I copied and re-saved it as PNG.
