The differences between masculine and feminine features to improve my portraits
I am no professional artist and don't draw any portraits, but I hope to offer you some insights free of prejudice and textbook mantras.

The woman on top doesn't look weird, masculine or ugly, she is just shaded unnaturally.

Light source

Every highlight and shadow depends on where your main source of light is positioned. In the lower drawing the woman is looking into the direction of the light source. In the upper drawing it's not clear where the light is comming from. Maybe to the left? Maybe in the direction of the viewer?

Shadows

The direct consequence of light is a shadow. In the lower drawing, the jawline casts a shadow onto the neck and the hair casts a shadow onto the jaw. Where both shadows combine it's darker than in other places.

Let's first concentrate on the left side of the upper drawing:


Her hair surrounding her forehead casts a shadow on her face but doesn't cast a shadow on her neck.
The hair in general looks quite natural with a flow of lighter and darker areas 
The subtle highlights of her cheekbones and chin look very natural, too
The nose casts a shadow to both sides (but I know how f#ing difficult it is to draw a nose).


Now have a look at the right side of the upper drawing:


Most highlights indicate that the source of light should be in the upper left corner. The peak of her head should cast a shadow onto the hair on the right side, but there's a highlight instead.
Her right eye is brighter than the left one, as if the light shines from the right instead. BUT apart from that, the right eye is a perfect example of how it should look like with light comming from the left. You start with more details (more depth) on the left corner and let it fade into a smoth shadow to the right. Might be unintentional but looks perfect.
The cheekbone is again highlighted in a very natural way
On the jaw and neck light and shadows are reversed. The hair that is (probably) flowing over these areas is darker than the skin below. The perception of depth is absolutely destroyed and the hair looks flat or misplaced.


Anatomy

I cannot find any major flaw in anatomy in any picture. Maybe the ear on the upper picture is a little bit too high, but it's unmistakably a human ear. The round jaw and plush lips look very feminine and the proportions of the face looks about right. Good work.