B&W sig looks better without color in the text. Try darkening and blurring areas for more depth. Blend the chica in some more too. The second one is... Eh. Make those lines around the focal fade out a bit and put in some more BG effects. Text is kind of ugly.
top one is great, I would consider dropping a dark blue solid fill set to exclusion and a color overlay on top just to a bit of a vintage look. that is, after all, my solution to everything. it probably won't look good, but if it does, then it would look VERY good. the second one is nice too, but it's way too oversaturated. granted, the colors match well.
