I'm thinking this is relating to one of the animated movies... though I can't remember what the title is... "Sword of Storms" maybe? I love Hellboy and he somehow looks so cute here lol - tattoos and all~!
Yes! the animated movie is called Sword of the Storms, and the two demons where the Sons of the Storm and also the Brothers of the Dragons. They were trying to awake their brothers. And thans!! I'm glad you like this! Please check out my gallery if you'd like to see similar works!
And well to be honest I didn't think of it! This is a fanart based on the Sword of Storms animated movie, where Hellboy fights a series of monsters (oni, yokai and even yuurei) from the Japanese folk. The two demons above him are Thunder and Lightning, the Sons of the Storm and brothers of the dragons.