After reading some comments,I saw that most of you think about this kind of problem in three different ways.
1 - "Just show both male and female characters in the promotional arts and everything is gonna be just fine".
2 - "Never use the main character in the promotional artwork,and always use a symbol,a villain or an NPC."
3 - "I dont care about who is the cover boy/girl,I just want to play the game".
The first two seem ok to me,but the third one gets my attention.
As it was stated before in this thread,the default PC is an icon.It shows who is the main character/who you are going to play with.
A lot of people never used Sheploo,the same way many people didn't want to use the default red haired Femshep,and yet,they are always depicted as the main characters in the promotional arts.
My point now is,if Bioware is going to show the main character in CGIs and promotional arts,they just should just present him/her covered inside an armor,with both characters being equally presented.
Or even better,they could simply ignore the PC in the promotional arts,and simply use a nice view,a companion or a symbol like they did with the collectors edition.