I wish you could preach to some about journal photos. It's a real pain to download a large image of mostly background. I like details but I'm on dial-up and it is extremely frustrating to spend 5 minutes waiting for an image only to see that about 75% of it is concrete.
Cropping to the subject is quick and easy. The software is free and works on every platform out there. That 2048x1536 or 1600x1200 image doesn't have to stay that way. If the real meat of the photo is a 431x177 chunk in the middle, then just crop the waste out of a copy and post the "odd" sized image. There are no laws requiring an image to be 640x480, 800x600, 960x768 and so on.
Thanks, Martinsr, for posting such good advice.