For me, I believe that Garrus is the best choice for femshep, and Tali for male shep because both these characters stand by Shepard's side from the beginning of mass effect to the very end, while others would leave
You know, I imported my ME 1 character and I'm now replaying ME 2. And I just realized that my character looks just like the way you draw Shepard! My Claire Shepard's hair is a bit more brownish but still, they look very similar. And she also has a thing for Garrus. So needless to say, I love every time you upload a piece like this.