Some black & White data visualization checking

I thought it would be a good idea to check how my interface would look in black and white, so here are my main pages in black and white.

Some more improvement

After some more user testing and discussion with my tutor, I decided to make extra changes to my interface. I stylized my "energy  friend" in a way so that it looks more unique and original and less like stick figure. I also changed font on my buttons to make it more readable. In addition, I changed background color to pale green, so it is more pleasant for the eye. Here are some scetches and developments of my energy man and screen shots of  developments of the interface.