Father/Daughter Silhouette Tattoo design Idea

This is what a business in United States was looking for in their tattoo design

I need 2 tattoo designs that are similar and tied together with a theme but are different as well. I would like to get 2 tattoo ideas (1 for each of my daughters). I really like the one that I attached but would like to change it in a way that it is unique and then design another one that is similar to it for my other daughter. I would also like to incorporate their birthdates into each of their tattoos. Here are some things that I am looking for
1. Simple design like the one attached
2. Father/daughter silhouette
3. I really like the heartbeat theme
4. They are both interested in softball so I would like to incorporate that into the design. Maybe with a softball or by making the little girl in the design a softball player
5. Birthdates that I would like to incorporate is 9.29.2008 and 7.3.2011
6. Simple design no color
7. These will be on the back of my calf so relatively smaller. Read more