I really like your choice of legends
One minor change you could think about is changing the ISO enter key to icon + text as well (like Ivan's cyan enter from the Dolch GB color pack).
Besides that I think you could drop the "alt gr" keys (I am saying this as an ISO user). Half of the legends are wrong for us anyway so why bother with the small detail. I actually prefer my spacebar to be surrounded by symmetric alt keys
I don't understand the idea behind the Row 1 "DEL END, PG DN" keys. Is that for Lightsaver support?
I also really like the color (although it's always hard to judge by the mockup). I think it would really go well with vintage cherry beige set that are widely available on ebay for cheap