The pink one looks too slutty for my taste. I'd expect that sort of dress to be worn to a fancy dress party and then binned afterward, what a disaster.
The red one is nice, looks very formal and is definitely something I would like to see my girlfriend wearing, doesn't look like it would ever go out of fashion and would certainly make them stand out in the room they were in. Very pretty, and a wonderful shape, too.
Ugh, that green one just looks horrible...did they forget to iron it or something? It looks like she just quickly pulled it out of a box and put it on. And that arm thing...it looks like it would work but we are looking at some weird girl looking to the side...do girls stand like that when they are outside? I don't think so. Too weird..you'd look stupid. It looks stupid, in fact. Next. :)
Well the black one isn't interesting at all. That one screams 'I just got back from work and I couldn't be bothered to change into anything else!' and also, it clashes horribly with her pale skin and red hair..she needs paler skin to pull that one off. And the belt is just...meh. It's not interesting and it's not eye-catching. Also, why bother showing so much skin and not show off your legs? That's a wasted prospect, right there.
Blue one is a slutty summer dress that isn't formal at all, and would only look good on Hispanics. The colour is lovely, but the style of the dress is not - and it certainly doesn't match her glasses. Belts are meant to be worn round the waist, not the stomach, either. Top of that, the material looks tacky and you can't really judge a dress if she's not standing up.
If it wasn't obvious, I've chosen RED dress because it looks simply beautiful. The rest are just yuck. :)