Yes, you can sue for copyright infringement.
A photograph that you have taken -- with or without a watermark or
logo -- is your property, and is automatically copyrighted from the
moment it is created. No one else has a right to use that photo
without your permission.
You can read a bit more about this at the official site of the US
Copyright Office, here:
How to Secure a Copyright
However, just because you *can* sue, doesn't necessarily mean it's a
good idea to do so.
Before explaining, though, two caveats:
1. Please note the disclaimer at the page bottom...Google Answers is
not a source of professional legal advice, so take everything here
with the appropriate grains of salt.
2. My familiarity with copyright is largely from the perspective of
US law...if you are asking about another country, you may need to
modify some of the information presented here.
That said, filing a lawsuit is a big deal, can be a very time
consuming and expensive undertaking, and may not pay off in the end.
Unless you can demonstrate to the court that you've suffered
significant economic loss from the unauthorizied use of your photo,
they are unlikely to award signficant damages.
Infringement can result in punitive damages (in addition to any losses
you experience), but this is generally limited to works that are
actually registered with the copyright office (registration isn't
required to get a work copyrighted, but it is an option, and affords
some extra protections).
You didn't mention whether your photo is registered or not, but I
suspect it isn't.
A quick overview of what can or can't be had as the outcome of an
infringement suit can be found here:
You may want to simply contact the users of your photo, and insist
that they take the photo off of their site, or pay you a fee for its
By the way, you don't necessarily have an unlimited right to take
photos of commercial products like a Sony TV, and post them on your
site. Sony has certain rights to control images of its products.
While it's highly unlikely a major company would take action regarding
a photo that wasn't defamatory, anything's possible!
I trust this is the information you needed, but if there's anything
else I can do for you, just let me know by posting a Request for