I progress a little bit tonight. I didn't change at all the topology problems, that I know and you show me, I prefer finish most of the body, adding all the details, and then, cleaning it!
But you (all) are true on these modelling problems (the most important problem for me is the loop missing between the nose and mouth..)
And this model won't be animate, I only do some pose.
The model will have 4 arms (that what I start today), two legs and a tail (in fact, two tails...). I have to work a lot the connection of the two arms, actually, I don't like it...