Note: This logo will be used for the macos App and the coming iOS App. So it should fit in a square a be visible in smaller resolutions too.
I have explored already many possible designs ranging from peacock feather, to colored pen. I want something simple. I like the new trend that use transparency and gradient inside logos.
For the color, I would something sophisticated more on the Google Play logo side or Slack but not something like the "Google" "G" logo, which is too "playful" in my opinion. I would like to have also more than one color since the goal of the App is be to design text, it would be closer to the App "philosophy".
As for the shape, I tend to like simple geometric shapes. But, I would like something abstract, not too much representing something, but suggesting instead. Something creative and fresh. Could be minimalistic like iAWriter macOS App logo.
There is also three important shapes here: the pen, the brush and the circle (which represent a style). These elements could be or not integrated in the design (see the sidebar in the last screenshot to see them all).