Do you have any idea at all as to why companies watermark pictures?
It's to protect them from copyright infringement. You don't just go use someone's watermarked picture for a photo gallery or any other use.
Copyright infringement is both unethical and illegal. SitePoint neither promotes or allows promotion of illegal activities.
Besides which, debasissarker said he needed a photo gallery... not photos for a gallery. There's a difference.
And since, the op hasn't returned to this thread or SitePoint since it was originally posted, thread closed.