Both images have numerous sensor spots that need to be cleaned up.
I would say that the rose photo also has exposure issues - the leaf is very dark and has no visible details.
The ice block needs the horizon levelled out and I think the colours are oversaturated. I'm not sure why the ice has a purple hue to it, but it doesn't look natural.
I hope this helps.
Flower looks artificial and the lavender background doesn't do anything for it.
I'm not even sure what the 2nd object is supposed to represent -- melting ice with a star?
Honestly, I don't see much commercial value here. Who will buy these? What would they use them for?
In addition to what @reedesign1912 said: you have a lot of noise because you took the picture at ISO 400. If you took this picture using a tripod, you could have lowered the ISO. The flash introduced spots on the bowl. And this triggered chromatic aberration:
You should have edited these spots out. Try softer light.
The black leaf is black in black pivoting really around 0,0,0.
Those spots make your camera unfit for stock photography. The corrections would eat too much time. You should clean the sensor or go to your preferred shop to get them cleaning the sensor. When changing lenses, you need to pay attention to the atmospheric conditions and work fast. So, for example, I rarely change the lens on the beach or in a workshop or a different windy and dusty place.
The ice is melting and that is not a great view having that patch of wet in front. The picture is noisy too.
Your backgrounds are too colourful. You need a grey, black or white backdrop. That enhances the subject, and you avoid reflecting colour on your subject.
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