Hello @gifmaker thanks for sharing your work!

As some of you might already know, I'm trying to help other designers to evolve there skills. https://steemit.com/design/@neutronenkind/design-critique-service

I like your documentation and i also like your implementation for the new logo, but i think it's very similar to the Picasa logo as you can see here:

So i would recommend you, think about the name of the tool "Darktable" and think about what that means for a photographer. Maybe you get some fresh new ideas through that process.

I hope that helps :)