Do NOT reduce the number of pixels. As you may know, many technical faults can only be found by looking at the original pixels very closely.
I reduced the pixels for this post here, when I post the originals they are at 5400x3700, so is there another problem?
There is a problem -- that you have not shared your original pictures with us. To find faults, Adobe will look at your pixels closely; if you want an opinion on your pictures here it is important that you share the exact original images with us. All the images now have problems with focus, but this may be because you reduced the size.
As you don't share full-size pictures, a serious assessment is not possible. You absolutely need to share full frame pictures. Apart from issues where you need to examine a whole image, most of the errors get simply eliminated by reducing the resolution: sharpness, chromatic aberration, noise, ... However, looking at the pictures, I have the impression that 4 is not very sharp and may be noisy. The foreground is also disturbing. 3 is not well framed, but I doubt that this is enough to get the picture refused. I suspect other prominent defects.
I would share one or two pictures per post. Not more. Analysing takes time. You can look at your pictures at 100 and 200 percent and if you see artefacts, you need to correct them.
If you are new to stock, you should consider these resources: https://helpx.adobe.com/stock/contributor/tutorials.html
Please read the contributor user manual for more information on Adobe stock contributions: https://helpx.adobe.com/stock/contributor/user-guide.html
See here for rejection reasons: https://helpx.adobe.com/stock/contributor/help/reasons-for-content-rejection.html
and especially quality and technical issues: https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html
All are over-saturated. #2 has a leaning horizon.
I inly looked at the first two. They both are not properly focused and if you magnify the photos, -you can see artifacts.
It's impossible to critique these due to their size.
In the meantime, read these links: