Use a ternary rather than multiple &&

[oliverjam]

Here you're rendering one thing if showZombie is true and another thing if it's false. A ternary would probably make more sense than two separate &&s

{this.state.showZombie ? (
  <img
    draggable="false"
    src={icon}
    alt={"zombie face"}
    id={this.props.id}
    onClick={this.toggle}
   />
) : (
  <div className="empty_img" id={this.props.id} />
)}