I'm also painting some surface lights right on the edges of the structures.

Custom brushes in digital media world

Refining a little bit.

Custom brushes in digital media world



Custom brushes in digital media world



Custom brushes in digital media world



Custom brushes in digital media world

I've had not one of my good days back there when doing this so that is why I wanted to create something creepy and scary.

To create something scary you can apply some filter to roughen the edges.

Custom brushes in digital media world

I will also set the color more
 
in Yellow. Just apply the photo filter on the whole image (top layer_ ).

Custom brushes in digital media world



Custom brushes in digital media world



Custom brushes in digital media world

And another color manipulation.

Custom brushes in digital media world



Custom brushes in digital media world

Some details using plain square brush.

Custom brushes in digital media world

We are done here. My creepy sketch is finished.

Custom brushes in digital media world