Mariah...
Virtually any of today's lenses will create sharp images if used correctly... However, for portraits, a shallow depth of field (distance between nearest and farthest points of acceptable focus) will give the impression of a sharper image by isolating your subject from the background.
Hi, thanks for your reply Rpcrowe. Yes you pointed out one thing that I still lack and that is holding a camera. My hands still shake too much, what can I do about that? . Should I use a tripod ? I really do not want to carry a tripod with me all the time.
If you desire to shoot portraits, the Sony SEL 50mm f/1.8 OSS lens is a very affordable option. IMO, it is better for the A6xxx series of camera bodies than the FE 50mm f/1.8 lens.
Besides focusing correctly, using a shutter speed that is 1.6x your focal length or faster will reduce camera shake. As an example, shooting with a 50mm lens on an A6xxx body would require a 1/80 second or faster shutter speed... After you get used to holding your camera, you can usually get sharp images at slower shutter speeds using OSS (Optical Steady Shot),,,
Sharpness, though, is one of the criteria but certainly is not the only criteria for a god image...