[P/O W. 'Moggy' Cattermole]

Yes, the pilot looks pretty good really. If I saw that, i'd know he was raf. However, you can get a lot more detail on a 1/32 figure, though i understand that his paint scheme is a very basic one at the moment.

If i were being really picky, I'd say the blue is a bit too bright, the colour of the RAF's blue is a bit more dull and slightly darker, like this, as the blue on the pilot is his RAF uniform.

I'm not sure about a Spitfire mkI being a conversion of a seafire, though you could probably get away with converting the seafire into a MkIX, though i'm no expert on these things.
For paints for the BoB scheme, i'd suggest Olive green and dark earth, both Matt colours. For the underside of the aircraft, Duck Egg Blue is good, although i think at the time, the official scheme was black and white on the underside, one half of the aircraft black and the other half white. Some squadrons unofficially replaced this with duck egg blue though.

I can only give Humbrol paint numbers, but i have a chart which has the equivilent paint numbers for other brands:

Olive green = Humbrol paints 30 = No apparent Revell equivilent
Dark Earth = Humbrol paints 29 = Revell paints 87
Duck Egg... = Humbrol paints 23 = No apparent Revell equivilent