1. It's blurry, the central figure is probably someone else's artwork and it demonstrates really poor Photoshop work - zoom in and look at your messy background.
2. The tshirt itself is very blurry, making the applied text look very unrealistic; again the background is a mess.
3. Ask yourself what a Buyer would do with this collage of poorly exposed, blurry images, some of which have IP violations...
4. Again, a very messy background, and is that your artwork on the t-shirt?
Adobe would have given you the reason when they rejected the images. It could have been "Technical Issues", "IP Violation", "Missing Property Release", "Lack of Aesthetic or Commercial Appeal", etc. All of these would apply to your photos.
Take a look at your photos at 100% magnification - none of them are in sharp focus and there are lots of artifacts, haloes, in each of them. The colours are oversaturated and the photos are overprocessed and poorly edited.
Also, anything with a logo or an image would require a property release to say that you are the artist that created that image (e.g. the image of the woman on the red t-shirt or the blue Buddha image.)
The collage of photos of the apartment isn't useable in it's current format - the photos should be submitted individually, not in a collage format. There are the same focus issues, artifacts in that picture as well along with IP violations of logos on the appliances that would need to be erased.
If you are new to stock photography, take a read through some of these resources that may help you out.
Adobe Stock (and any stock photography site) is looking for good quality, commercially marketable images. When you are submitting photos, it is always good to think about who would want to buy that image and how could they use it? Instead of submitting a photo of a t-shirt with images already on it - think about creating an image that a t-shirt seller could buy to put on their t-shirts to sell.
If you are new to photography, it would be worthwhile to take some photography classes (there are many free tutorials available online) or if you can, join a local photography club.
Best of luck with your future photos.