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You have a nice kit to get started on, but yeah, the lenses you will want to upgrade as time goes on. While these petroglyphs are very cool to see, in regards to getting great landscapes from an area like this, it's going to be very difficult. Now if you had shot at a different time of day, either early or later so the light was softer would help. Having some clouds would really help. But these petrolyphs are stuck amongst a brushy scrubby area, so even with that, your chances of really being successful are limited.
#3 is my favorite composition from the group, again, better lighting and clouds would really help that. #1 is my favorite of your petroglyphs, but it has some pretty harsh light at the bottom of the shot, perhaps cropping off the bottom to lose that might help. Processing the shot with a layer mask to pull more detail in the bottom would help too, or just having shot that composition with softer light.
In #2, there is just too much brush and stuff poking up from the bottom... not too appealing. And #4 the hills seem too hidden in the background and there is a square shadow at the bottom that is distracting.
You will find as you go that watching the weather and shooting when the forecast has clouds, and also shooting when the light is the softest will have a great impact on your shots. As you grow in your photography, you will learn how to make midday cloudless shots look better, but in the end, there is just a limit in most locations as to what can do with those conditions.
I hope that helps,