"Oh God, she's smiling!" "NIGHTMARE CREATURES OF PONYVILLE! She is here to socialize with ponies so that we can all be GOOD FRIENDS! She is myself, the one you call Molestia! Together, we shall do friend activities such as... puzzles, and... hugging, and... OTHER THINGS!"
This is very nice, good color, shading, the works. Very cute. My only issue is with... the title.
"Thou" means "you", so by saying "Thou shall greet you", you're saying "You shall greet you", which makes little sense. If you want to say "I shall greet you" but still use second person informal in there somewhere, you could say "I shall greet thee".