I uploaded some photos to Shutterstock, which got through to review. They were all shot on an Olympus OMD E-10 Mark III, as JPEG's. All had the same resolution of 350 dpi, 24-bit and were 4608x3456. All 5 were rejected citing
Focus: The main subject is out of focus or is not in focus due to camera shake, motion blur, overuse of noise reduction, or technical limitations of the equipment used (e.g. autofocus searching, camera sensor quality, etc).
Noise / Artifacts: Content contains noise, film grain, compression artifacts, pixelation, and/or posterization that detracts from the main subject.
Is it as simple as uploading RAW images, instead? Or are they rejecting due to the technical capacity of my camera?