Is that what you're supposed to do with those tomatoes?
Here's a few pieces of advice:
1. People just aren't that good at estimating their time. 2. You need to use paper for more than just a counter. If I just want a counter, I'll use stones in a bowl. 3. You need a reason why people would want to keep around their printed copies of the number of pomodoros.
Here's how I would change things: Think about helping people get better at estimating the number of pomodoros they took to do an exercise.
The printout should have a date, a description of the task, and an obvious way to count off pomodoros BEYOND THE NUMBER ESTIMATED.
Suggest that people refer back to previous printouts of pomodoros, so they can figure out why tasks are taking longer than estimated. (Tasks never take shorter than estimated.)
That might be useful. But you'll still need to say why it's better to have this printed out, than to have this information on your tablet, hidden behind a password.