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Another great one is the Irish Mannequinn. I thought BPG blows up the edges, because every other format smoothed them out. But no, when you compare to the original, all the interesting edges (hair, hanging fabric, top of the lips) should be very visible.

I really like the results!

Yes, it seems like BPG is smarter in finding interesting parts of the image.

If you look at the Air Force Academy Chapel, the horizontal window bracing are almost completely eliminated when comparing BPG and the Original.

JP2K-Medium seems to preserve a resemblance of the dots

Yep, I really liked the look/size tradeoff of JPEG 2000. It's too bad it hasn't caught on, particularly for cameras as an alternative to JPEG.

That looks like an aggressive chroma subsampling/quantization.

Image encoders must allocate the bitrate among the channels, luma (Y), and chroma (Cb, Cr). Most of the time it is better to allocate most of the bitrate to the luma, because that's what the eye is most sensitive to. However it can create artifacts like this.

The issue I had was with how the cheeks lost their colour, when compared with JPEG.