because anthro characters have bigger legs and thus also bigger bottom halves.

Full image here: https://www.dropbox.com/s/9tm71aq7r.....ttoms.png?dl=0

It's a bit of a rougher sketch but it still took me some time to draw, I was planning to do backsides but it took too long so I won't draw that.
It's a bit of a comparison for dragons of different body type comparing the size of the lower half as well.
There's 2 unique character's here. The first one is a new character I came up with, the little round dragon Keltz. I already drew him before in this piece (NSFW): http://www.furaffinity.net/full/17188166/ I get asked a few times if I would draw one of the random characters more so I figured I make a actual character rather than the random ones I draw most of the time. Hes inspired by  Kitora's style as well as that of  SodaSorbet. His horns however are inspired by that of  MODCA's dragons as well as that big evil dragon from the comic Poppy O'Possum, his top horns go in a full circle. I'm not sure yet about the rest of his design. I made him mainly to do naughty stuff with similar looking dragons. He is roughly 210cm in height which I guess you can use as a reference to figure out the height of the rest of the characters.
The second unique character is Kaji, the tiny dragon in-between the big dragon and Keltz. It's one of  Gillpanda's characters that I drew as a bit of fan art. The comic Gillpanda made with that character in it is really good, I read it while I was drawing this so I figured I draw him in there seeing as I was already doing some size comparison between these dragons.
I'm not sure how big he really is but I'm guessing about 30-40 cm tall.

Took me a total of 4 hours and 20 minutes to draw and 30 minutes to do a digital cleanup. 1 Hour 35 minutes for the big guy, 1 hour 15 minutes for Keltz, slightly over a hour for the one to the right, 25 minutes for Kaji, the remaining time was used to fix a few things later on.