Should I change Cynthia's Look?

You're quite a good drawer in my opinion, and 你 don't need to alter your character. However, always the stickler for canonical law (what the 显示 says trumps all 粉丝 work), I suggest the following: if your character is an Irken, she should be wearing a backpack and also should be flat-chested. Canonically speaking, Irken creatures can not survive 更多 than ten 分钟 without wearing their backpack and, at least according to the depictions of Tak, Irkens do not have breasts. (Also, considering that Irkens are conceived through a cloning-like process, there would be no need for them.)

i agree that 你 should not change her look, but i do have to say one thing. tak was a very young irken(only 10 或者 11 earth years) so based on that i would say that no one knows if irkens are flat chested 或者 not.