Uploaded two images that led to "Internal Server Error", while one worked fine

Just recently tried uploading a bunch of images for Fraymakers, and I only uploaded three so far: the first one worked fine, but the next two only returned broken images, and clicking on their links led to a page saying "Internal Server Error". Not sure what happened with the latter two images, but the first one uploading fine implies a server hiccup to me. Can the two problematic images be deleted so I can re-upload them?

Here are the errored images in question:

Ok, coming back to this after an hour or so and the images work again suddenly? Really must've been a server hiccup, I guess. False alarm in that case.