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I would say that this is a personal decision that you need to make. If disabling the right-click makes you feel more safe, then go ahead and do it.
Connor is correct though... it does not prevent more advanced users to coy your images. Furthermore, the right-click disable does not work on Firefox. You can try watermarking your images but again, more advanced users can still manipulate the photo and try to claim it as their own. You can have a copyright disclaimer on your site but again, this does not necessarily put a stop to people who are determined to have that image.
However, having said all that, it may stop some people - those who aren't as advance in HTML and those who want to respect the work of the site builder.