1686: Missing blacks, as shown in the histogram.
1691: guess what?
You also have a white balance problem, the assets are too cool. The background also shows a high noise level. And you have chromatic aberration.
_ALE1686.jpg - the window is blownout, and you've missed focus on their eyes. The composition is awkward with the large piece of furniture in the foreground.
_ALE1712.jpg - also an awkward composition due to the large piece of furniture in the foreground. Shooting up the woman's nostrils isn't the best compositional decision either...
ALE1691.jpg - same as above, and their faces are unfocused.
Ok, muchas gracias por la evaluacion.