It's a great idea, and it seems a good map. Although, I'd want to remark that Spain is divided in current provinces, and in that time they were different. So, the nearest provincial division, the 1822 one, was slightly different (
https://commons.wikimedia.org/wiki/File:Spain_-_Territorial_division_of_1822.PNG). They was a different system dating from 1817, but was not uniform, at the Old Regime style, and therefore it would be ugly for a WL map.
Also, the regions of Spain "España Uniforme" "España Incorporada" or "España Foral" were not regions, but also different kind of Old Regime's economical or political system (The second one is the former Aragon Crown, for example) so I suggest changing it for the real regions, also shown in the provinces' map.
Other than that, congratulations :)