Quais os critérios para reprovação por "Falta de Apelo estético ou comercial de imagens"

Both can be a reason. Commercial appeal is rather subjective, quality is objective. Quality - white balance, composition, contrast, and focus are the issues in this photo.

Adobe does not see a chance to generate many sales, so they want to avoid adding this to their database.

I think Adobe could also have refused this on quality issues, as the picture is out of focus and missing contrast.