Well it's not just one person not seeing the differences.  So - 

You asked us to really look at those lips.  Sure I will, and after doing so I do see a tad bit of difference.  However, how long do you guess a person stares at a MP character to determine whether or not it is box vickie before deciding to buy it?  My guess is not too long - if I have to wonder at all whether or not it is box vickie Ill pass.  I imagine those at Daz who are deciding feel the same way.

If you are afraid that changing the eyes more will take away from your look, then try changing something else - but ALOT more needs to change.

When you say ethnic - specifically which ethnicity do you mean?  Perhaps that should get determined and you should look up dominate features within that group. 

I am:  aka Velocity3d