This is an interesting topic MjayP.
I don't take any care if they conform to my 'style', as I don't know what that is...and in a way I don't want to be boxed in by having my own style, I think you have listened to quite a bit of my stuff on SC, do you think I have a 'style'?
Since being on SC I have had to stick the label of a genre against each one, but some I have no idea of what the genre is, so I made my own up 'Parsleyorama'
So in a nutshell I let the style just evolve, you'll know if you think the song is very much like one of your others, so be honest with yourself, and your listeners will thank you for it.
hope this helps
cpm