I think what you really mean is that you have acknowledged your bias. You take in information based on your own cognitive biases, including your appraisal of these two messages.

To me they both seem neutral in language. Neither states anything directly about the candidate, other than having information about them. This is an example of my bias. I’m not American so I don’t have the same emotional reactions that lead me to believing one or the other is more biased. To me the only thing I can say is that the Republican one is a stylized photo whereas the bottom one looks to be a photograph.

Not necessarily. One snip gives an example of a positive quality of the person in question paired with a positive leaning photo. The other gives no such example of quality paired with a photo doctored to (at least in my mind) resemble historically negative figureheads.

This is a form of bias and propaganda.