Tagging on to your comment because you’ve covered most of it here.
In addition to getting close to your subject, if you can find an angle to shoot that maximizes the distance of the subject to their background, that can increase subject separation which also helps perceived sharpness.
Jan WegenerJan Wegener has a great video on sharpness that talks about some lesser-considered factors in perceived sharpness.
Tagging on to your comment because you’ve covered most of it here.
In addition to getting close to your subject, if you can find an angle to shoot that maximizes the distance of the subject to their background, that can increase subject separation which also helps perceived sharpness.
Jan WegenerJan Wegener has a great video on sharpness that talks about some lesser-considered factors in perceived sharpness.