I'm new in this platform and I submitted my photos for the first time, but they were rejected due to technical issues. I don't know why and I would like any feedback about them. I will thanks any information.
B&W is the kiss of death. Nobody will buy them. Stock customers expect color images. If they need B&W later, they can convert them in Photoshop.
Stock customers expect highest picture quality and composition for use in commercial advertising. Examine your images at 100-200% magnification. Your images contain too many artifacts. See links below.
Better luck next time.
I'm afraid your composition isn't that good as well. Composition is an important part of photography - unless it is just for a memory keepsake - a snapshot - like your photos.
Have a read of this from Adobe as well about how to create better photos: