I spent about 15-20 minutes for each drawing. It will be faster if you just use premade template. I think this approach is great for visual journaling and urban sketching too and will be useful  for quick drawing practice.

For the first drawing made in Paper by WeTransfer, here is my 3 step process.

Sketch :

Paint :

Finishing Touch :

For the second drawing made in Tayasui Sketches School, here are my 3 steps process.

Sketching :

Painting :

Finishing Touch: