I think the colors definitely work better ! I would make them even more bold- Why stick with grey, black and white when you can have up to 8 colors!
You could also play around with the composition more. Repeating patterns, different sizes, shapes.. the possibilities are endless :-)
I think these are too generic to really stand out, try to play around more!
A modern style! Good!
i like the simplicity, but not the "négligé" good luck!!
LoL would also fit!