First, the color balance looks plausible in the picture you post, but of course I wasn't there and I don't know what the guy's skin color really is.

Second, stone is a bad gray reference unless you have specifically measured it. I think your basic mistake is assuming the stone is supposed to be gray. Since you give not justification for that, I'll assume you just made it up. When a scene doesn't have a known gray or white object in it, you have to take a separate picture with such object.

Third, the real problem with your picture is elevated black level.

Here is your original:

Here is a slightly processed version:

The black level is now black. For gray reference I used the white part of the pigeon at the left edge of the picture. That's not a good gray reference either, but should be better than assuming some part of the stone is neutral gray. The man's skin tones look plausible, especially for someone of Indian decent, but of course I don't know what they are really supposed to be.

There is a haze over the picture, particularly in the upper right corner. I suspect there was bright sky there just outside the picture, and the lens wasn't all that clean. Fingerprints or similar smudges on the lens can cause this kind of effect.