That’s pretty good, considering it’s a first attempt. One thing I would change is that the shield isn’t really between “you” and the dragon – it’s a bit off to the side. I realise you don’t want to block our view of the dragon itself, but that can be solved by moving the shield down, with the dragon visible over the top. The dragon also needs to be in the centre, looking directly at “you”, like it would be if it was actually breathing fire at you. Of course, if it’s actually aiming for the shield instead of the person holding it – making it a pretty dumb dragon, but if that’s the way you want it – that’s fine and you can ignore everything I just said.
