wow. they sure used some good soil for the pix at the btm.
the only thing I would do different would be to make it a bit wider and flatten the top so as to prevent 'quik' runoff.
I found with my compost pile and woodchips pile, that the rain washes off too fast if it is not flattened.
when |I made my raised beds, I put alot of twigs etc in the btm.. and corn stocks. then a layer of fresh chicken manure, then about 8 inches of decent compost. the beds are lumber sided to about 2 ft high.