I particularly like the gun and figure with the match in this set (and the French one). Interesting imagined uniforms with the green facings. I think if I 'imagined' my own I'd go super colourful á là Murat, haha!!
This looks very effective and suggests that your Imagine Nation army will be very well painted! I think the grey with green facings is perfectly good as an artillery uniform. What colour coats are you intending for your line infantry? And will they be based on 1806 Prussian figures?