Hi,
so far there are no available statistics except the number of downloads in the Adobe Stock Supplier Portal. However, Adobe plans to extend these functions in the future.
A typical beginner portfolio I see here with the usual popular motives of all hobby photographers of flowers, plants, butterflies, animals and landscape with the equally typical mistakes in the picture design.
Basically, these are areas that, as you can imagine, have already been massively served and are offered millions of times in the image database. Here you have to provide exorbitantly good images to be able to distinguish yourself from the extremely large competition in order to be able to achieve relevant sales.
Your pictures seem to me to have been edited extremely in the image editing and therefore seem unnatural. Exposure is often unbalanced, contrast and saturation too high and clipping is not really good.
Here it would surely be recommendable to use the inexhaustible source of information of the Internet in order to develop further here and to optimize its picture results. The Adobe Guide for vendors also provides valuable information on the market requirements in the stock business.
I think with appropriate commitment you can make enormous progress here. The important thing is patience and perseverance - it can't be done overnight.
Greets,
v.poth