Hi Mirko,
I would be inclined to suggest that the nasality of your tone could be because of a too dropped soft palate rather than a raised tongue. What your teacher is getting you to do with sucking the tone into the back of your throat should help ok. I like the picture of the chewing gum too.
Generally though in my experience, a raised tongue causes throatiness and a gripped tone.
Did you know that Lilian Stiles Allen the soprano and teacher of Julie Andrews, used to hold her students tongues down with a table spoon during exercises! Not sure I'd recommend that though!!
Let us all know Mirko how you progress. Just occurred to me too: don't get nasality muddled with nasal resonance either. The latter is very necessary for the voice to have carrying power.
Best wishes,
Ian Belsey. Voice wrecker to the stars!
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