Not sure how it happened (probably slowly, I was pretty tired) but this sketch reminded me pretty strongly of a 3rd ed D&D black dragon, and I took a halfhearted stab at making it a little more like a 2nd ed one (mainly by adding horns that I hadn’t planned for, but they’re not nearly long enough):
And for completeness’ sake, I got off my duff, pulled this down from a shelf and took a picture of it because I couldn’t find a good picture of a black dragon from 2nd ed:
![2nd ed Dragon's Den](http://www.dragonaday.com/wp-content/uploads/2015/06/2nd-ed-Dragons-Den-300x169.jpg)
The red and Green heads are not quite on par with what I remember from the 2nd ed Monstrous Manual, but black white and blue are (Click to Enlarge).