"Always look eye" - Mr. Miyagi

Yes, it depends on the status of the person you are talking to. If they are "superior" to you in terms of age or position etc then typically in Japanese culture you shouldn't look at them in the eye. As you correctly noticed than when "subordinates" are talking to their boss or master they always look down at their feet and never make eye contact. Having said that, you are not Japanese, so I'm sure a bit of friendly eye contact will not be misconstrued as anything negative. In my experience of working with Japanese people for several years, we always would make eye contact as otherwise (as you stated) it looks like you are not trustworthy or lying! Hope that helps.

Too much eye contact can seem aggressive, but the idea of "how much is too much?" varies between cultures. So yes, you're probably right when your "normal" Brazilian eye contact becomes "too much" to Japanese thinking. Good on you for paying attention to things like this.

Lol, thx. But it doesn't answer my question yet. In Brazil to keep eye contact while u talk is a sign of trust and honesty, but it doesn't seem to happen in some Asian cultures.

depend on the person lol