The framing looks alright but remember if you render a picture in black and white it becomes dramatic and moody.
Now from the 5 skills of drawing,the perception of relationships and edges because only a single light source the shadows become harder
and from a high angle casting a shadow over Christine's chest,not flattering to her profile (perception of edges).
The choice of clothing is not suitable because it's a floral print and not fiqure hugging.It does'nt blend or harmonise well with the environment of black and white (perception of relationships).A plain tank top would show more of her round shoulder and back which is flattering to a woman.
Lines whether horizontal or diagonal can be used to lead the viewer's eyes in this case diagonal lines form an apex like the tip of a triangle
like an arrow's head (a directional sign).One to the face which is good and the second one formed by upper arm and shadow to the armpit.
If you had another fill light to light up her chest or the underside of her arm then this would not happen (perception of edges).
Her head and hair is not well defined (perception of edges).An accent light or rim light to profile her head/hair would look better and make the picture more complete (perception of the whole).If you aspire to be a professional or be good at portraiture,small details make or break a picture.There is a strand of hair over her right eye and the bit of hair on her wrist breaks the flow of the diagonal line.Is that a shadow at the corner of her lower eyelid of her right eye or is it eye shadow or a mole? Anyway photoshop can remedy this.There is a bit of a gap of hair at the right ear exposing a bit of ear and neck,cover it with more hair for cleaner lines.You are lucky that your lighting at the right angle produces catchlights(reflections of light source preferably at 10 or 2 O'clock) at the irises of both eyes which make the face more alive.You can increase the contrast of the catchlights if the effect is not strong enough.
As an exercise use a piece of paper/envelope to crop out the lower one third of the bottom to a square frame.Now with only one apex it draws the eye to the face and overall tonal balance is even don't you think? Overall I don't find the picture contrasty at all,it's even which is good.Making a portrait is not so easy huh? Not like people telling you to shoot,shoot,shoot.