Colour or Black and White

The next thing I want to decide is if I should 'colourise them...either purposefully selecting colours, or using gradient maps. I think this slightly detracts from the images when they are coloured, and they, to me look less professional, polished and maybe more consumer friendly?
I may consider printing some of these to sell as prints, but ultimately, I feel the black and white images are the stronger.

 

That is not to say these colour images aren't strong, I fell the fourth image above, works incredibly well in its own right. But I do feel their strengths are inconsistent, certain colours work and certain colours don't, it then becomes more about the colours selected instead of the image, and the discordance of the image and what it represents would be lost.