To start, I am new to photography and drones. I’m still learning and studying settings, basic photography rules and skills. Since I bought my drone, I’ve strictly just been playing with settings, different lighting, and landscapes. As you can see in the photos below, my images are turning out what I believe would be referred to as “grainy.” My videos have also been coming out the same. Any suggestions, reasons, hints as to why I’m getting these results?
Thanks I’m advance!

what ISO are you using?

Were these downloaded off the micro sd card on the drone or from your display device (phone). The quality of the pictures and videos transmitted to your phone is only 1080 (HD). If you want the full quality media (UHD), you will have to download it off the card in the drone.

Are you using ND filters that are too strong and compensating by increasing the ISO. Take off the ND's if so and keep the ISO at 100.

This is definitely ISO problem

It's either a high ISO or those are the "preview" pictures of the DNGs, which look grainy and have lower resolution. Please give information about the files. (size, file format, resolution)

Hi there, I appreciate your time bringing this query to us. May we know if those photos are from the Mavic 2 Pro's SD card or from your mobile device directly? If the photos are uploaded from your device, I suggest you try to reset your camera settings and try to capture again so we can check. Please keep us posted for further help.

We need to see your settings to give some advice on that.
ISO
Shutterspeed
ND filters?
What color profile (settigs)