I think the style works really well for outside locations! Simple, yes, but it really looks cheerful, colourful and "childish" in a good way. The inside location, for some reason, looks not so nice. It could be the colours, or maybe it's just that I'd expect a bit more perspective and detail in a closed room.
By all means, keep that style- it really is quite unique, and if oyou are comfortable/happy with it AND it is speedy... well, triple win.
Also- who's the guy in your avatar, I have seen him somewhere and can't remember where...