High and open evening necklines are compared here through four clearly different upper edges. The burgundy dress supplies the actual high-neck reference. The black and red gown shows a deep V, the navy dress a curved strapless edge, and the red dress open shoulders with long sleeves. Those three open shapes are contrasts, rather than varieties of high neckline. Their purpose is to help you specify the coverage you want more accurately.
Look first at the distance between fabric and neck. Compare the sleeves separately afterwards. The long red sleeves make it particularly clear why sleeve length should not stand in for neckline height. You could use these images in a fitting discussion and mark one wanted or unwanted line on each. Add jewellery and hair in the next comparison: a closed bodice provides a different visible area from a deep V. Skirt fullness, shine and leg openings remain additional features of the individual images. Setting those aside initially makes the neck decision clearer without requiring you to copy the whole style of one reference dress.
