HI there,
I made a small workshop for you, to demonstate, what I think, and maybe those 2 critiquers before me, is an improvement on the border.
I've cropped of the red border you've chosen and with the Eyedropper tool in Photoshop I picked somewhere the red colour of the boat.
With that colour I've created a new border. All directions same dimension. Could have chosen for more height maybe, as you did, I like that approach..but I forgot.
Hope you like this and fine it useful. It's easy to execute..if you have such a thing as the eyedropper tool.