Terminal command to delete all images in folder and subfolders?
To just list them (for review/verification):

find MYFOLDER -type f \( -iname '*.jpg' -o -iname '*.png' -o -iname '*.gif' \) -ls


To move them to the Trash:

find MYFOLDER -type f \( -iname '*.jpg' -o -iname '*.png' -o -iname '*.gif' \) -exec mv '{}' ~/.Trash/ \;


To delete them directly (no way to get them back unless you have a backup):

find MYFOLDER -type f \( -iname '*.jpg' -o -iname '*.png' -o -iname '*.gif' \) -delete