The lens you have covers the focal lengths that most folks consider for portraits. (80-135mm in full frame nomenclature).
For your camera divide by 1.6.
For portraits you generally want to isolate the subject from the background, so a wide aperture is desired.
The Canon EF 50mm f/1.8 would be an 80mm equivalent on your camera and the EF-S 60mm f/2.8 macro would be a 96mm equivalent. The EF 85mm f/1.8 would be a 135mm equivalent.
Set your lens to 50, 60 and 85 and see which framing you like best for your type of photography and pick the closest prime lens.
John Hoffman
Conway, NH
1D X Mark III, Many lenses, Pixma PRO-100, Pixma TR8620a, LR Classic
