this one has a light infantry officer picture from this unit on page 7, plus many more from this army
PDF link
seems blue coat with poppy red collar&cuffs, silver buttons and single epaulette), black round hat with red (Bourbon) cockade plus red-topped green plume, although this is light troop, so centre Coys may not have it, blue overalls, black hussards boots
other troops seems to favour black helmet of Tarleton style, which is quite unusual elsewhere, so fun to paint.
plus, if you can get Tranié & Carmignati "Napoleon's War in Spain" you have several examples of 2-sicilia kingdom's uniform (that had a chance of having been sent to east coast Spain, even if they did not go out of port) on page 176 (grenadier, light troops, etc..)
receives a gift from his wife…