Logo size and placement

[Lcrutledge]

I have read a couple of different articles that talk about logo placement. Some say keep it in the same place all the time. Some say move it around to help keep you picture "safe". Some say you can size it differently based on your photo and media while some say to keep it the same. With the first picture, the logo is the same size that I start out with, but it seems way too big in this instance. The second photo has a smaller logo, and I've used soft light to reduce the attention away from the picture. Is there one right way to do this?

[Damien Symonds]

For what purpose are you adding a logo?  Is it simply to advertise yourself, or is it also to prevent image theft?