If you did add special effect to the original image, then all you need to do is to go back to them and do basic correction and resubmit. However if this is the way you too these images, I'm sorry they cannot be fixed. The images are too black without details. They will not make it.
The following links will provide you with guidelines that include what you need to do to get your submission accepted, and what you should not do.
The shooting was specially conducted so that only silhouettes were visible. It's not effect or correction result.
The general lighting conditions are not very good. The photos themselves are underexposed (look at your histogram) and the subjects are not sharp - e.g:
The colour balance is not so good either. (Even if it was intended.)
I don't think these images can be corrected to suite Adobe Stock.