Blue is my favorite color, but dress #4 in green is my favorite of the choices given.
The jeweled clasp at the waist on dress #4 adds just the right touch to set it apart from the ordinary.
I do not particuclarly care for dresses with only one shoulder strap, like 1 and 2.
The style of dress #3 is a classic style, and "would do" but isn't special.