I don't know if you approve of this but I copied this (by looking at it) and it was soooooooooooooooooooooooooooooooo much fun to draw and that isn't a feeling I get a lot unless I have a really good idea in mind I'm very happy you made this picture!!
This defiler looks quite good. The only reference to defilers in SC2 is in the campaign where you can use tissue samples for research. The infestor took the defiler and queen's places as casting units.