Cheekbones and chin aren't particularly prominent on a round face
Tend to be circular in appearance and have no major angles or edges
Note: Fuller faces are not automatically "round" just because they have rounded curves; you can have a full, rounded heart-shaped face, for example; this is mostly about bone structure and proportions
Recommendations:
Pixies with volume on top and styles with center parts can be very flattering on round face shapes
Opt for longer fringe and face-framing layers to lessen the appearance of width and help add angles to your face (adding a "frame")
Sleek bobs are extremely flattering, particularly if they are an inch or more below the jawline
Avoid styles where the majority of the volume appears on the sides of the hair; aim for volume above or below the mid-face instead
The goal is to minimize the appearance of width and add definition to the angles of the face