Does personal photo on the website improve its credibility?

I know there are several techniques to improve website credibility like putting client references, portfolio (or any proof of work and its presentation) etc. Does personal photo on the website improves its credibility? For example, http://www.atulesh.com/ and http://www.adhamdannaway.com/ have personal photos on the main page. I understand that my question is general and there are different websites where having personal photos would impact credibility differently. But I'm interested in a specific case: having my photo on the personal website (as a UX designer), like those two websites above.