Dont know if it will give any information but on the other site this question was posted on there is a conversation in the sawing and drying forum titled "best saw cut for walnut". In that thread there is some recent talk about quarter, rift, flat. It was always my understanding that there was quarter sawn, and fully quarter sawn. Locally we've always had two call outs for quarter sawn, one was perhaps 70-90 degrees and then fully quarter sawn being only material very close to vertical (I thought it was a tighter tolerance than the post stating 75-90 degrees). So if you ordered quarter sawn you were going to get some fully and some that was just quarter sawn (usually 20-30%).
Depending on what your lumber supplier offers you would either have to pay a premium for them to sort you out only vertical grain or you'll have to roll the dice and sort it yourself and put the extra on the shelf. We have a good supplier but never had to ask for a load of vertical grain. I think they would do it but I dont know what the premium would be.
The picture does look like a but its always easy to armchair QB a job without any of the details.
Keep in mind when looking at this picture, it is what photographers call a HDR (High Dynamic Range) image which is comprised of multiple photo exposures. The idea is that since a camera can't duplicate the human eye (yet!), a photo is digitally altered to increase the dynamic range by combining two or more exposures. This is very common in interior photography since the lighting in these environments is pretty flat and uninviting. As you can see above, the HDR image looks pretty warm and dramatic.
Therefore, when looking at the finish, the "real" finish more than likely doesn't have the same coloring or depth you see above. Good luck!
Looks like you are getting good info. I would simply add that you might want to have pieces sanded with varying grits of SP say 150-320 or maybe even scrape the faces before you do your coloring.Even color is the key to achieving a nice look. Especially if the panels are plywood.