Whether the artist did a good job at making her appealing or not is debatable, and regardless of whether they did it's still massively sexist to design the one female character for sex appeal and design all the male characters to look practical, powerful and cool.
sorry, I can't say I agree with you there. Maybe he/she did not intentionally design black widow the way you say he/she did. You may see it as sexist, but it could be viewed differently as well. I'm not trying to negate your opinion, just expressing mine. to me, the outfit may not be practical, but it definitely looks powerful and cool, so therefore I really like this drawing but that's just me.