Big D - WIP

YIKES! Can we say I'm a glutton for punishment? OK, I've started my next challenge and challenge it will be. I'm drawing a gorgeous Black Friesian gelding. His nickname is Big D.  
The problem is the photo I'm using is not that great.  
However, I wanted to challenge myself so.... Here is the start.
Obviously this is just the sketch getting the layout correct.
I've darkened the drawing so you can actually see what I'm trying to do here.
Once I'm happy with the sketch, I will transfer it onto the working surface and start the details.
Hope you like it so far!

Thanks for stopping by :)