Depending on how you have your profile preferences set...you should receive an e-mail when someone posts a comment about your photo. If you don't, you can always click on the thumbnail of your cake and scroll down. The comments will be listed underneath your description.
Also, I noticed (when I looked at your photos), there isn't an option to post a comment. You have to change that setting in your preferences. I'm not 100% sure how to do that, but, I think it's under the profile tab to the left of the screen. You have to check "allow comments".