thanks for all the replies there, although i could say the last two ones where more informative

Meanwhile, based on the first two replies and on some articles I read, I already did some pruning (before reading the last two replies).
So here's the result:
here's is front
http://www.flickr.com/photos/georgeyboy/180772762/
here's back
http://www.flickr.com/photos/georgeyboy/180772564/
here's back detail (apex)
http://www.flickr.com/photos/georgeyboy/180773122/
here's sideways
http://www.flickr.com/photos/georgeyboy/180772372/
you can choose view all sizes to see larger image/more detail
yes you are right there's is almost inverse taper. i tried to prune more at the upper part but still there is way more volume on top. But would be safe now to cut again back to one or two leaves? And is it the right time to do so?
And you lucky luke you are right there area lot of branches to choose (look those at the top!), some of them are at the inside of the curves but most of them are at the lower part so i thought i should leave them so the tapering won't get worse.
Also notice at that back detail pic how the upper part of the tree is, what should i do about it?
So what i do now? Should i cut more? I've already pruned more than 1/3 of the foliage!
PLEASE HELP!!!
