I just love Construction Drawing and thats why I teach it in my course. Its a valuable professional tool. This is a great example that i found on Pintrest.

Land Of The Free, http://www.eni-art.de

The branches on the outer edge, the trees inside are really nice and earthy. Plus

~ tracerhank

No coffee can keep this little one awake. Line art: Sakura Micron pigma pens and Copic pigma pens.