Luke, ultimately its a matter for yourself to be convinced about but as good practice when taking pictures of all fish it is advisable to hold the fish nearer the body so issues of scale do not arise and also, and more importantly, this puts the fish at less risk of flipping out of your hands on to the ground.
On this picture it even looks as if you are leaning back making it very much more difficult to asses accurate size from the photo.
I am not sure if you are an experienced angler so forgive me but, did you on your new scales remember to both zero them before weighing the fishing and/or deduct whatever you weighed the fish in?