These are just my opinion, I don't have any special insight.
Butterfy.jpg: Has a lot noise and appears to not have sharp focus.
2 flower jpg: These are better but still have a fair amount of noise that becomes obvious when zoomed to 1:1
Always check you images at 1:1 and not just the subject. Noise is often most apparent in the low detailed out of focus backgrounds.
Best of luck,
I agree with George - there is a lot of noise on the images
Noise removal software will fix it - and show up any areas of soft focus
Otherwise, keeping your light levels up will help and your shots will emerge with the clarity that they deserve
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.
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.
Have a look at these guides: