Try getting your knees further apart and your arse higher in the air. You should be aiming to get your head in between your knees really.
Other than that, can't see much wrong, looks like your surfing to me.
It's pretty hard to get a gauge from the angle the vid is shot from. Try getting some footage from the beach.
For me, good style is (as well as something I don't have) reading the wave well so it's surfed to the end. And done in a way which is fluid, economical and powerful. As you can't see the wave ahead of you in the video it's hard to see your approach to riding it and to see what you are doing in relation to it.
At the end of the day though, all that matters is how you feel. You know at the end of a wave if you've ridden it well or if you've had to fight the beast or wobble your way through sections. So if you think your stance feels wrong change it.
Don't get hung up on front/back foot. As long as you're reading the wave right your gonna need to weight each one on different parts of the wave. Generally though, weight your front foot to go faster and back foot to slow down/turn. Get your back foot over the fins.
The two bits of advice I always come back to are: get skating on a halfpipe/bowl. And surf a singlefin. As you can surf already, I'd say get a slightly longer, wider shape to what your riding now. Learning to ease it through turns and having to draw longer lines to make sections should iron out bad style.
Don't get disheartened though, like learning most things. The more you learn, the more you realise how much more there is to learn. This can sometimes make you feel like your stagnating more than you are. Ever so often you'll have a session where you nail something new. Watch videos and mind surf too. I think you do most of your learning going over you waves in your head and trying to imagine new approaches to the wave.
Good luck. Don't forget, arse up head down.