You should post an array of pictures of yourself and focus more so on substance than on how good you look in those pictures.
If you only focus on posting your best looking pictures on a dating site, you could easily fall into the temptation of using pictures that do little to convey the kind of person that you are.
You would mostly be posting pictures where you look your best just so that you can attract more attention.
So much depends on your attitude when it comes to online dating.
If you are bitter about being shorter than 5’7 and reflect that bitterness in how you go about constructing your online dating profile and how you go about chatting with people on the dating site, you will have a difficult time attracting a match.