Research : Hieronymus Bosch.Complete Works!

Source:
http://blog.naver.com/taschenbook/70188420681

My Topic:

 How can we estimate Hieronymus Bosch as a surrealist painter or a holy picture painter?

What I hope to learn from this source:
 I want to find some information about what the painter usually drew.

Notes:

1.  Bosch's paintings are populated with grotesque scenes of fantastical creatures succumbing to all manner of human desire, fantasy, and angst. One of his greatest inventions was to take the figural and scenic representation known as drolleries, which use the monstrous and the grotesque to illustrate sin and evil, and to transfer them from the marginalia of illuminated manuscripts into large-format panel paintings. 
2. Alongside traditioanl hybirds of man and beast, such as centaurs, and mythological creatures such as unicorns, devil, dragons, and griffins, we also encounter countless mixed creatures freely invented by the artist.

Final Thoughts:
 The painter usually drew dragons and evils which appeared in Bible and unreality world. I think I need more data to inform his unique vision or fantasies.