So I’m not gonna be hurtful or brutal xD But, I’m gonna be honest.
I’m interested in how sexualised it is, if it’s just a gender-bent Saitama. He just wears a shirt and washing up gloves xD If that’s the direction you wanna go, go for it though!
So, for starters, the cape. Material is difficult, but Saitama and One Punch Man in general is actually a masterclass in how material can be drawn really well. His cape is attached at two plates on his shoulders, around the collarbone area. So the material bunches up around them and then flows up and over his shoulders. So the folds would actually go down and from the shoulders and neckline, it gives it a lot more volume.
I don’t really see any issues with the face. It’s not really a Saitama face, but it’s fine as far as faces go.
As for proportions. The proportions are actually fine. There isn’t really anything that looks like it shouldn’t be the size it is. It’s the pose that looks a bit off, I think that’s the main issue with the piece if I were to pick. To be able to see the face in that kind of three-quarters side profile view, you wouldn’t see the shoulder that far forward, it would be further back. Her back also wouldn’t be in full view, and the butt would be more side-on as well. The shoulders, back, butt and boob that are in the shot all go well together, but her face is then in the wrong place. It just doesn’t really work.
A test for the future, try and do the pose you have your character doing in fron of a mirror. If they’re looking at the [camera] then you should be able to look at the mirror. If you tried this pose, you probably wouldn’t be able to look at the mirror, not even out the corner of your eye.
Aside from that, I love One Punch Man, so this is a fun piece in my opinion The colours are a little desaturated but it works for your shading style. I would say what to work on after doing a bit of practice on posing is how shading and highlight really works. Having a light source in mind that dictates where shadows and highlights are on the character in focus.
Keep it up, I hope this was helpful in some way!