Javier,
I really enjoy your photography, especially because I know many of these places, and because I think you have a lot of talent. These scans are cool, but they are still in RGB mode... that is, the mode is color, and it is imparting a bluish tint to the pictures that actually makes them a little... cold.
I hope you will not mind me taking the liberty of copying one of your photos, changing it to greyscale, then punching up brightness and contrast. Just for comparison sake. It is subtle, but I think it makes a big difference.
I think you might like the result. Have a look and let me know what you think and then I'll remove it from my host. If the color cast is intentional, I apologize... Either way, this is good stuff.
Best,
woof