Although there are lenses that are more suited to certain subjects, often it does come down to personal preference. For example, though wide-angle lenses aren’t normally recommended for portraits some photographers like to shoot wide angle to capture more of the background. Its always worth playing around and experimenting and finding styles and settings that you like. But for general guidance here are some types of subjects and the lenses that you can use to capture them, with example shots.
If you want to perfect your portraits then as mentioned before, lenses that have proportions similar to the human eye are best for shooting portraits like the M.Zuiko Digital 25mm F1.8. Wider angle lenses tend to cause distortion and can often make noses and foreheads for example look much larger. There are several lenses from the Olympus M.Zuiko range that will capture stunning portraits and with their F1.8 aperture will allow you to play with depth of field and create amazing blur and bokeh.
The M.Zuiko Digital 25mm F1.8 lens can shoot beautifully balanced portraits with some stunning blur plus its great in low light. The M.Zuiko Digital 45mm F1.8 lens not only shoots great portraits with plenty of blur thanks to it 1.8 aperture, but is also affordably priced so it’s a perfect first addition to your kit if you want to start experimenting with aperture and depth of field. The M.Zuiko Digital ED 75mm F1.8 lens has amazing shallow depth of field and can create incredibly crisp and high-quality portrait shots also. Its narrower angle of view does mean you will have to stand even further back than the M.Zuiko Digital 45mm so it is not always suitable for indoor spaces. And proof that lenses often have a wider use, despite the M.Zuiko Digital ED 30mm F3.5 lens being targeted as a macro lens it can create really pretty portrait images also and with some background blur too.