Now it may not look like it, but this is an improvement. My right leg hurts less and is not as badly swollen as it was, even though it looks pretty bad compared to my uninfected left leg. (My left leg may look like there's a big welt about halfway along my lower leg. That's actually a scar covering a dent in the bone leftover from when I was about 12 years old and fell through the bars of a cattle guard. I didn't break my leg, but it was close.)
I tried today to keep my leg propped onto another chair, and as much as I could, I applied an ice pack to the most inflamed areas. It did help and it does reduce the swelling. So I reckon I'm going okay. The key thing was did it get any worse, which it did not. Also — and I do this as part of my diabetic self-care routine anyway — I check the feeling in my feet daily and make sure there are no sores or such. In addition, I applied skin lotion to the swollen leg to help alleviate the strain on my over-stretched skin.
I'll keep tabs on everything, but the first day after starting the antibiotics seem to be doing their job. Fingers crossed that they keep working.