Keep it Simple.
No artistic experience is needed to draw!All you need is a pen, paper, and your observation skills. Believe it or not, how the drawing turns out really doesn't really matter.
That's why it's great to draw with pen or marker. That way, you must use every mark that ends up on the page, which requires creativity. So you get to exercise and strengthen your visual thinking skills along with your creativity and the same time.
Don't know where to start? Try just drawing the outline of things.No need to be perfect.Most of the time, close enough is actually more interesting!
This quick and simple drawing was done in my travel sketchbook while on a job in New York City. I didn't want to carry by big markers around with me, so I just used a think black pen and a small gray marker for shading.