Better late than never, I suppose.
I'm posting this twice just to show the difference between the photo size of which my old blog template was capable of displaying versus the new one:
So here's 500px scaled to 432:
...and here's 1000px scaled to 700:
...and if needed, I think I could squeeze in a few more pixels -- maybe around 730-ish.
Regardless, I think is an improvement, especially for a blog that mainly features images.