Do you think it is best to deactivate listings that don't have quality photos? Or items that no longer fit with your store? Or leave them in hopes that the more you list the more people might see?
I've removed a few things not due to pictures or anything but just because they don't fit with the current theme in my shop but before I put them back up I will likely tweek them a bit : )
If you feel they no longer fit in your shop then removing them may be an option.
If you just don't like the photos though they can always be re-done. More than once I've had something in my shop that sold shortly after I tried taking new photos!