Image rejected for Technical reasons.

I think the composition is also a problem. If you want that object, in that background, I would at least try to have an even amount of space around the object. Ask yourself too: what is the story? What does the picture say? Who will it say it too? Imagine an advertising campaign that might want the image, and what they would sell. Imagine a presentation to a hall of 1000 people which uses the image - what is the presentation about?  This may help you make market-focussed images.

Hello,

It appears to be taken with a smartphone, so due to the small sensor, the pixels begin to show up when enlarged, so because of this, it can cause image problems if printed to a large size - like in advertising.

The image is not so sharp and clear.

Also, you have cropped the image too tightly. You need more room around the edges. And the background is not very good. It's not aesthetically pleasing.