"You smell good!" 
They know your insecurities, you smell like food

"You can tell me anything, even your insecurities!" 
They will just judge you if you tell them anything

"Your hair smells really good."
They know your insecurities, you don't smell good

"You're really smart!" 
You aren't smart if you can't answer a single question and need to ask the teacher

"You're a really good artist!" 
Next step: "Can you teach me how to draw?/Can you draw me?"

"Your skin tone is really pretty!"
Your skin tone is normal/average

"You don't smell awful!" 
They are only feeding your bad habits

"You're pretty!"
Thank you, but what do you want from me?

Everybody just wants something in return, no matter the situation.