Thank you all for your advices.
At first I've taken today some more foliage off, so I could see the branch structure better. I'm thinking of removing (as Oscar said) the right big branch because it's very large and straight and compared to the other branches next to them it's very thick.
Also I agree with Fr. Tom that I first need to find out what the front will be. Without that, I can't choose which branches I need to stay or cut off. I'll work on this tree next week, and then post some more pictures.
Also said I should make some shari to make the trunk looks more interesting. I would reallly love to do that, but I don't have the tools for it, so I need to try find someone who has these tools and would help me. But the basic thing I need to do now is giving it a first styling.
Thanks for all your replies, I really appreciate that!
If you've more ideas, please let me know.
Youri