...unless the subject of your photo is a different part of the body, of course.
you probably know all of this, but i'll type it out just in case it can help someone:
if you're using the default autofocus area mode of your camera, you're letting the camera decide where your focal point is going to be...and the camera never gets it right. for snapshots, especially when using wider-angle kit lenses with small maximum apertures yielding a lot of DoF, this isn't a big issue. but if you're doing serious portraiture or wildlife work and using wide open apertures to blur out your backgrounds, limiting your DoF, you need to have your focal plane dead on. on some newer mirrorless cameras (i'm not sure which olympus models you have) there's an autofocus area mode for detecting animals' eyes and focusing on them...this is an invaluable feature as it allows for worry-free composition. on DSLRs and older mirrorless bodies, the best solution (and it's what i do) is to use single point autofocus area mode, where there is just one point in the VF that the camera will focus, and you put that point in the frame where you want your subject's nearest eye to be (it's an extra step but well worth the effort). then, looking thru the VF, you lay that little square over your subject's eye, acquire focus and snap. obviously, this is more challenging with moving targets, like birds in flight, and there are more suitable AF area modes for that. also, i set up my camera to use back button focus instead of doing the half-shutter-press...i find this to be more helpful in acquiring and locking focus. when shooting animals or people, i'm looking to get this kind of focus on the eye(s)...of course, i don't always get it:
worth noting: even the older mirrorless cameras have eye detection AF for people and it is an invaluable tool for shooting portraits or people in the streets...it allows you to compose as you wish and the camera will find the eyes of your subject and lock in focus on them no matter where they are in the frame. i shot this with my lumix G9 using eye detection AF area mode:
finally, you mentioned the DoF of my lenses. it's true that when you use prime lenses with larger maximum apertures, you're going to have more control with image separation, but even if you're using consumer grade or kit zooms, you can still turn your backgrounds to butter by positioning yourself correctly in relation to your subject and the background. first of all, when shooting something like birds, shoot wide open whenever possible...this is good not only for image separation but will accommodate faster shutter speeds and/or lower ISO. when shooting at longer focal lengths, you'll automatically be decreasing your DoF, helping to make your subject pop out, but also you want to position yourself as close to your subject as you can get and try to shoot at an angle where you have no nearby distractions in the frame and the background (foliage, landscape, water, whatever) is as far back in the distance as possible...and if you're really close to your subject, the background doesn't even have to be that far back to get creamed out. all these shots were made at f/6.3 or smaller, and most kit zooms can open up at least to that aperture even when fully extended (the toucans were shot at f/8 with the zoom extended between 440mm and 500mm):
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