OK, let's put it another way that might make more sense.
1. Customers come to Stock and search for assets by keywords.
2. When you submit an asset, you choose the best keyword for your subject so customers can find it in searches.
With that in mind, what is your keyword for this?
- Now search Adobe Stock Inventory for this keyword and compare your image with what Stock has right now.
- Is yours better? As a customer, would you buy it?
Maybe now you understand why subject & composition are vitally important in Stock Photography. No subject, no composition, no sales. ☹
Hope that helps.