Portrait is for indoor only. On a point and shoot you have to select portrait before you can then select "Macro" (close up). Yours should have a stand alone Macro function.
Landscape works good. Try full auto as well. Also, given the low light, try nightime, but override the flash to off. Dont have funky shit in the background like those wooden arches or w/e the fuck they are. Otherwise, theyre fine for a first try.
But, always, windows UP, tire tread turned AWAY from the cam. Show wheel, not tread.
Also, dont have lines bisecting the pic. Which is why Im not bothered by "field shots". Theres plenty of calendars and posters of cars shot on grass. Youll always have a horizon line, but dont add to it with that cart path or w/e it is in the first pic. Lawn/field shots allow a simplicity of background, fewer elements to distract from the subject.
Lastly, Google and read about "The Rule of Thirds".
Ohh and having the park lights on for some shots makes for a cool effect.