Hello, EmilioT!

You did a good job. But let me give you some tips:

1. In your image, cultural specializations change places in different eras. Try not to swap them.
2. Take only the drawing and the name of the culture. There is no point in duplicating the specialization again.
3. White lines intersect white letters and it doesn't look good. Try to avoid this somehow.
4. There is a lot of empty space in the image. Try using space more efficiently.

Alternatively, you can try to make something like this image: