I usually do the oil change first while the engine is warm, not hot, then wipe up spills, then the oil filters.
Degrease & steam clean the engine block before the plugs & air filters, don't want to get too greasy do we?
Oh... Wait, 
Oil paints are notorious for taking their time to dry, but that depends on how thick it was applied, what it was thinned with, the surface applied to, humidity, 101 other things you wouldn't even dream of...
I would test an inconspicuous bit, or the bit you did last, (eg the underside?) with q-tip/earbud(?) or white tissue paper wrapped round a cocktail stick.
Key point, does it come away clean, if so test on an inconspicuous bit, or the bit you did last, before committing to the whole model.
My usual mistake is to rush the last bit, & put it on too heavy, so the usual advice is to apply several light mist coats & don't rush it...