item_profile_image.dart

Material(
  elevation: 4.0,
  shape: CircleBorder(),
  clipBehavior: Clip.hardEdge,
  color: Colors.transparent,
  child: Ink.image(
    image: AssetImage('assets/profile_default.jpg'),
    fit: BoxFit.cover,
    width: 120.0,
    height: 120.0,
    child: InkWell(
      onTap: () {},
    ),
  ),
)

@searchy2
onTap: onTap: () {},
remove the dublicate onTap:

@searchy
to remove the rectangle shape use clipBehavior: Clip.antiAliasWithSaveLayer,

Card(
      clipBehavior: Clip.antiAliasWithSaveLayer,
      elevation: 3,
      borderOnForeground: false,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(80.0),
      ),
      child: Ink.image(
        image: AssetImage(IMAGE_START),
        fit: BoxFit.cover,
        width: _progress.value * (80),
        height: _progress.value * (80),
        child: InkWell(
          onTap: () {},
          child: null,
        ),
      ),
    )

Thanks for the catch @amreniouinnovent !