Recently all my pictures have been rejected due to image quality/technical issues, but I don't personally see the issue. of anything, I think my images have gotten better... Anyone else have any tips or critiques? These 3 are some examples.
Did you take these images with a smartphone? They tend to have noise issues when zoomed in closely/enlarged. For stock photos, images may be enlarged a lot, so the image needs to be clean.
Composition could be an issue as well. The background is rather messy - the butterfly is lost in the grass for example.
The WOW factor is often mentioned in the Adobe Stock guide for succeeding in Adobe Stock. Your photos lack the WOW factor. They are not outstanding. This subject material is very. very common, so it needs to be something special to succeed.
Please zoom your files to between 100 and 200%. You will see that the edges of the flowers are not well defined and there is also halo around them.
While I do not see a halo around the butterfly, it edges are also not well defined. in addition there appears to be an out of focus grass leaf that runs across the wings.
In addition to the technical issue above all your files are showing excessive noise/grain - both color and luminance.