The Model 3 already has a similar front end to the Model S/X. I like it.
I would say the Model 3 is the best looking one of the three. The S has a gap at the top that looks misplaced, like they didn't want to change the hood when they did the facelift. The Model X has a similar gap, plus the front is too tall and the curves just aren't quite right, in a way that makes it look like smiling lips.