I have never thought of abstract photography as an own style, but it absolutely makes sense. Both photos are good, and I think both are great with colour, because they live more through texture than through light/dark contrast. Especially the first photo is very strong in its contrasting colours of the greenish patina and the reddish rust. In the coloured version the shadows draws the observers view directly into the centre of the image and so adds to the dramatic of the photos.
Love them both <3