I decided to zbrush more often so here is the beginning of my sketchbook. I decided to start with something I really like so I chose Mass Effect. Here is my sculpt so far. 2 hours into it for a Salarian. I am making a bust.

I am basing it from this image. 

Here is the link to the sketchbook if you want to check it out.

http://www.zbrushcentral.com/showthread.php?1071220&p=1071220&viewfull=1#post1071220