hi Danny, there are different shooting styles/profiles in the camera you can choose that can have effect on saturation and contrast etc but that applies to straight out of camera jpegs, a lot of amazing pictures you see are people shooting raw and doing post production themselves, "editting it to their liking" so to speak (sorry for a lack of better term), whereas SOOC jpegs are editting done by the camera itself, so can be a bit of hit/miss pending on what the camera believes gives the best result
also looking at your first pic for example it looks like it was shot in harsh midday-ish sun, which does not help you getting a good picture, picking the right time of the day and light to shoot is very important as well