A little tip....

Digital Painting Tip
As a little addition to the last post, I thought I would post a little digital painting tip... Making really loooooong straight lines with a wacom tablet is really hard. In photoshop use the pen tool or the selection lasso ( set for straight lines ) to create a silouette of the entire building using the shading/modeling color, then block out the highlite color ( In the digital painting below, I used the lasso, set for straight lines and a gradient ). This will not only give you nice straight lines. It is also waaaaaaay quicker ;)