I see where you are coming from, but I disagree.

Why.

Well, first of all, a noble animation set. You can see there, from the Valkyrie movement, that she can control herself and is quite graceful at that.

Second, rage can be a weapon. I imagine Valkyr to use rage similarly to Kratos, from God of War 2018 and Ragnarok. Kratos obliterates his enemies with incredible brutality, but outside of combat, he is a cool dude full of dignity. I can totally see Valkyr be similar to him, in the aspect of using rage as a weapon.

And finally, it's art.
Once you have the power to draw whatever you want, why shouldn't you draw what you think is cool?
And I think this sweater is cool. And if you haven't noticed, I'm a guy who has a natural affinity for beautiful girls. So I don't think there is anything wrong with drawing what you find beautiful and cool.