In my experiment, I have demonstrated that smiling is a simple matter of making the mouth into an arc, having eyes, and optionally a nose.
from p2p_system import get_data
import matplotlib.pyplot as plt
x, y, sizes = get_data('@jonny:my-project:Analysis1')
Downloading dataset @jonny:my-project:Analysis1 --------------------
0%| | 0/100 [00:00<?, ?it/s]
plt.scatter(x, y, s=sizes)
<matplotlib.collections.PathCollection at 0x12826dee0>
QED.