OK, just for instance; check the picture of the rudder above. Do you see that circle on it? That is an ejector pin mark and should be filled and smoothed over. And in the same picture, there is a seam that runs around the circumfrence of the rudder. a little bit of smoothing with a sanding stick would make it go away. All in all, you did a really nice job on a model designed to motor around in the water.