Please take note that in your render, you have UK ISO support built into the base kit, but it's missing one key: the R3 '@ key; the R1 `¬ is rendered as `~. The former needs to be added and the latter, corrected.
Also note that you could add one more key, R3 \|, to the base kit and with it go from UK ISO support to US+UK ISO support.
Besides that, I find it strange that you'd add the R2 1.5U \| key twice.
I won't comment on the colourway itself, as that strictly subjective, but I also find it weird that you have only accent-colored ANSI and ISO Enter keys, but the numpad Enter is present twice (mod-colored and accent-colored).