Reddit reviews Dragonart: How to Draw Fantastic Dragons and Fantasy Creatures

I think a good place to look for clues on these would be 'Guards! Guards!', where Vimes first meets Lady Sybil and Dragons play a major role (spoiler alert :D). Unfortunately I do not have a copy to look through right now.
Hope that helps!
Unrelated to the disk world, when I was a kid and little dragon fanatic I was a sucker for this dragon art book, which, if I remember correctly, had great drawing tutorials and few puns as well: https://www.amazon.com/Dragonart-Fantastic-Dragons-Fantasy-Creatures/dp/1581806574/ref=sr_1_5?keywords=neondragon+peffer&qid=1555035744&s=gateway&sr=8-5-spell

Well that mostly comes from practice, you do something enough (like sketching furries) and it becomes almost second nature to do it right on the first time.

You'll find the more you draw and the more you get used to your own style then you'll sketch a lot quicker and with a lot less lines. You don't need to actively try to draw with less lines, you'll just find yourself doing it after some time.

I know a lot of artists that paint and just draw a big blob as their first sketch and kinda chisel it down into a beautiful form and it leaves me so confused! But keep working and trying new things and your artwork will do wonders.

Also if you like drawing dragons then I'd recommend this book. I have a copy and when I wanted to draw some nice and unique dragons it really helped.