Create Custom Image Block Styles

block-styles.js

/**
 * WordPress dependencies
 */
const { __ } = wp.i18n;
const { registerBlockStyle } = wp.blocks;

registerBlockStyle( 'core/image' , {
    name: 'default',
    label: __( 'Default' ),
    isDefault: true,
  });

  registerBlockStyle( 'core/image', {
    name: 'circular-image',
    label: __( 'Circular' ),
    isDefault: false,
  });

  registerBlockStyle( 'core/image', {
    name: 'rounded-corners',
    label: __( 'Rounded Corners' ),
    isDefault: false,
  });