I did used to be a semi-pro portrait photographer so no doubt the differences jump out to me more than to the average person. One thing that should be quite easy to see is that the Pixel is losing a lot of detail in skin tones, both through overexposure and poor choice of color balance. Some of the Pixel images also have a lot of contrast applied (a matter of taste, up to a point, but it is often used to hide poor noise performance in low light portions of the image by rendering them black, and reduces editing options with the image after capture). But of course it’s not without reason that the Pixel got glowing reviews for its camera system when it came out, and it still puts in a decent showing.