If you look around at commercial web sites, magazines, sales literature, annual reports, etc., can you see your work being used there given the type of imagery you currently see? Styles do change over time but in general I'd say that the subject matter and overall feel of your images would be a tough sell as stock.
This isn't at all a criticism of the images, just the nature of stock where images are used for some purpose, not just because they're pleasing to look at.