The only thing with colors like that is that they fade FAST.
I've been dying my hair for years and reds, purples, greens, and blues will fade within the first few washes. Washing your hair with cold water will help slow the fading down but it will still happen faster than other colors. So if you plan to go through with it and you want to keep it that vibrant, be prepared to have to touch it up often :3
The first one's my favorite. I think it transitions into purple better than the fourth one. With an abrupt transition, you'd have to worry about whether the line was even or not, because if it wasn't, it would bother you.
Eh honestly none I usully don't like the whole colored hair unless its dark and iis with dark hair.or some people can pull of having it all colored if I had to choose id go with the 3rd style but not those colors id go with auburn(red) and eggplant(purple) its dark and looks like a natural hair color