You will need to get a volunteer or volunteers to help you create a few thousand variations of tubgirl with different facial expressions and different ingredients. There might be a couple folks that will watch those pictures specifically, but most of them prefer the breast and penis pics that you are all sexting back and forth. It won't stop all the snooping, but it will reduce the number of people snooping dramatically.
Each facial expression represents a different utf-8 or utf-16 character. You are going to need to make a LOT of pictures unless your messages are really simple. Each different color fluid could represent different voice inflections or perhaps a different character-set-of-the-day.
If I could get a volunteer, we could write the first "Hello World".