I just posted under the briefing a couple of key points that'll keep your designs on track.
Here's an important one:
Note that the briefing asks for a family of 4 designs.
Each design family should work harmoniously together but each separate design should be different from one another. That means a change in color should not be the only difference between the 4 designs.
So keep developing and try to make your designs vary more.
Moustache, Owls and Patterns.... please not... :((((