Advanced Hands-on Rust: moving_dragon - little mod - diagonal movment

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Hi,
I did a little mod of the Code: moving_dragon
so that the “dragon” can move UP/DOWN + RIGHT/LEFT (diagonal) at the same time

use bevy::prelude::*;

fn main() {
  App::new()
    .add_plugins(DefaultPlugins)
    .add_systems(Startup, setup)
    .add_systems(Update, movement)
    .run();
}
#[derive(Component)]
struct Dragon;

fn setup(//(1)
  mut commands: Commands, //(2)
  asset_server: Res<AssetServer>//(3)
) {
  commands.spawn(Camera2d::default());//(4)
  let dragon_image = asset_server.load("dragon_left.png");//(5)
  commands
    .spawn(Sprite::from_image(dragon_image))//(6)
    .insert(Dragon);//(7)
}

fn movement(
  keyboard: Res<ButtonInput<KeyCode>>,//(8)
  mut dragon_query: Query<&mut Transform, With<Dragon>>,//(9)
) {
  let delta = if keyboard.all_pressed([KeyCode::ArrowLeft, KeyCode::ArrowUp]) {//(10)
    Vec2::new(-1.0, 1.0)
  } else if keyboard.all_pressed([KeyCode::ArrowLeft, KeyCode::ArrowDown]) {
    Vec2::new(-1.0, -1.0)
  } else if keyboard.all_pressed([KeyCode::ArrowRight, KeyCode::ArrowUp]) {
    Vec2::new(1.0, 1.0)
  } else if keyboard.all_pressed([KeyCode::ArrowRight, KeyCode::ArrowDown]) {
    Vec2::new(1.0, -1.0)
  } else if keyboard.pressed(KeyCode::ArrowLeft) {
    Vec2::new(-1.0, 0.0)
  } else if keyboard.pressed(KeyCode::ArrowRight) {
    Vec2::new(1.0, 0.0)
  } else if keyboard.pressed(KeyCode::ArrowDown) {
    Vec2::new(0.0, -1.0)
  } else if keyboard.pressed(KeyCode::ArrowUp) {
    Vec2::new(0.0, 1.0)
  } else if keyboard.all_pressed([KeyCode::ArrowUp, KeyCode::ArrowLeft]) {
    Vec2::new(1.0, 1.0)    
  } else {
    Vec2::ZERO
  };

  dragon_query.iter_mut().for_each(|mut transform| {//(11)
    transform.translation += delta.extend(0.0);//(12)
  });
}

But how to change the Code, that the Image is changed when pressing ArrowRight key ?
That the dragon looks to the right when moving right.