Greetings!
I represent The Succession Wars Mod team, and unfortunately I can't speak Polish.
I am currently busy on finding and sorting all specific info about HoMM2, like unused graphics, partially implemented features and so on. I noticed here in the gallery some beautiful concepts of Phoenixes and a giant Toad, but I cannot seem to find a proof that these concepts were created by New World Computing.
http://pliki.jaskiniabehemota.net/h2/galeria/phoenixes.jpg
http://pliki.jaskiniabehemota.net/h2/galeria/minis/frog.png
Could someone direct me or just tell where those concepts are taken from? The only thing I was able to find is the link on the Acid Cave (linking here), but I was not able to find any other info source.