Technical issues

First picture: noise is not the problem, more the missing structure, a bit everywhere. As for the composition:

For the cat, you need more of the head in the frame and eyes need to be in focus for portraits.

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The photos are also poorly cropped. In the first photo, consider removing the lamps. In the second photo the object at the end of the pole is cut off. In the third, the bird should be removed. The artwork also probably needs a Property Release form.

In the photo of the cat, I think the depth of field is too shallow leaving most of the cat not in focus and not very sharp.  I noticed the eye in particular not being in focus, as well as the patch of fur at the bottom.  The whiskers had some faint but noticeable chromatic aberrations.  Something about the color seemed a tad off to me, I believe this was taken on a cloudy day next to a window but I could wrong about this.

In the photo of the birds on the pole, the object on the end of the pole was cutoff.  I would leave this either entirely in or out of the frame.  The white spots (seafoam?) were also distracting to me.

In the photo with the mountains/fog/lift, the cables on the lifts led my eyes out of the photo instead of into it.  I think the lights at the bottom were also a distracting element.  I wonder if this photo would have a better composition with the lifts removed and lights removed?

Thanks for letting me review your photos!  I hope it helps.

What do you think ? 

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B&W images are rarely accepted.  Stock customers typically want full color images.  If needed, they can apply their own Grayscale filters.

Technical issues aside, I'm not sure how much commercial value these snapshots have for professional content creators.  Stock customers expect visually perfect and well-framed images they can use in posters, brochures, billboards, movies, TV commercials, t-shirts, coffee mugs, etc... 

Poor focus is the most obvious issue with each of the images, and that can't be fixed; therefore I didn't search for other possible technical issues.