This picture has not been edited at all. Taken with a Canon DSLR. Grain/Noise problems??
According to the metadata on that image, you are using a Canon EOS DIGITAL REBEL XT and it was in auto mode. I have often seen that camera in auto mode prioritize getting the shutter speed and iris to certain settings and cranking the ISO a bit too high. When using Rebels, I always try to keep the ISO as low as possible.
That being said, your ISO was 400, which shouldn't be bad and it doesn't look all THAT noisy to my eye either. it might have been an error by a computer algorithm mistaking the gravel and fine detail in the grass for noise. (I almost made a grass seed/grain film grain/noise pun, but restrained myself.)
Thank you! Yes, the metadata is of course correct. I’m getting frustrated with Adobe Stock as the rejections seem almost arbitrary.