ichiro_ino said:
I am ambidextrous
I prefer my right hand, but when I'm tired I use my left, specially when making drawings...
try this one
http://www.allmyfaves.com/blog/weekly-faves/are-you-artistic-or-logic-maybe-both/

I can both see the image turn clock-wise or counter-clockwise at will
I can also see it do 180 degrees turns only (like a pendulum).
both the sides of my brain are dominant, but I can't seem to make it work at the same time...
just like when I make drawings, I get to create artistic illustrations if I ignore my logical side, but when I look at it with my other side, I always see that my art lost to perspective. That is why I need to coordinate it both...
you can also look at this

It just shows my artistic side and logical side almost compliment each other...
You need the help of Betty Edwards and her book "The New Drawing on the Right Side of the Brain"
The only book for those who want to learn to draw.
more info
http://en.wikipedia.org/wiki/Betty_Edwards