Hi Noah,
OP said something about this a few pages back in the thread.
The idea behind not posting images is that when the user uses your promoted offer and see that they get nothing, they realize it's a spam account. Later on, when you post images and they see them in their feed, they will probably unfollow you and report your account and/or posts as spam. The more reports you accumulate the higher the chance your account will get banned.
OP's method didn't suggest you should make the account look more human. It's just an account promoting something (your niche of choosing).
Using human-like accounts is another way to attack this method but wasn't in OP's original method guidlines.
If you do manage to get some results with posting images and having the accounts look as real as possible, by all means please post the results here and let us know