These are not technically and visually good enough for Stock images. Sorry.
Did you submit these to Stock already? Or you just testing the waters so see if they're good enough to submit?
I suggest your read the Contributor User Guide and compare your work with other Stock inventory to see what gets accepted. Whatever you submit needs good color & composition, proper focus (depth of field), balanced lighting and white balance. Please read these links.
All your photos are underexposed and out of focus. While taking the photographs the subjects appears to have been zoomed in on using digital zoom of a compact camera or telephone camera. Digital zoom most times do not produce good quality images.
Please zoom in on your files at between 100 and 200% to see the distortion.