find + awk approach:
find /home/myuser/parent1 -type f -name "*.png" \
| awk -F'/' '{ a[$5]++ }END{ for(i in a) print i,a[i] }'
$5- points to a folder name at the needed level
find + awk approach:
find /home/myuser/parent1 -type f -name "*.png" \
| awk -F'/' '{ a[$5]++ }END{ for(i in a) print i,a[i] }'
$5 - points to a folder name at the needed level