Hi! The images are quite small. Adobe contributor guide says that images should be more than 4 megapixels, but these images are smaller than that. The file size of 2048 x 1536 makes the image to be 3.15 megapixels. If you cannot use other camera, you need to make panorama photos. The next problem is camera artifacts. That is, camera noise. You can reduce it with Photoshop, or 3rd party tools such Topaz denoise Ai. One of your photos 08.jpg has a camera shaken slightly during when you took the photo. You can try to reduce that problem by using shorter shutter speed, or camera stand. Then we have the sharpening artifacts, that is too strong unsharp mask filtering. Some camera models make very strong unsharp masking when it's trying to prosess the imagees to look sharper, but if it's too strong, it's being seen as an artifact. If your camera allows you to record RAW files, make it do so so and then you can with image editor such Photoshop make all colors and other details of your photos be as good as possible. However, the biggest problem I think still is the camera you've been using. It's produsing small files that are not very good in quality. If you wanna take this job seriously, you need some better camera. I really recommend checking some old used cameras, to make it not too expensive (I'm myself using 10 years old Nikon D7000, which is recording completely okay photos for this purpose), and look some expert advice in some expert camera forums. You would also need to have some proper lens, which can be expensive. Also, it's very hard and often impossible to earn with stock photography back the investments we've done into our camera gear. These stock agencies do not pay very well from the sales and you need to have an exceptionally good quality in a photo and professional editing to be able to have many sales with it.
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