I feel bad being so picky, but you asked..... so, here goes:
This is what i meant with the tail markings: (i overlayed the image from Guppy)
those vertical Red, White and Blue stripes. The red needs to be larger, the white and blue thinner. as you can see, the upper frontal (left) of the white stripe just touches the edge of the stab. In your skin the corner is cut off.
Also, i think the roundel could be a larger still (lower edge of letters and roundel arent on the same height, roundel goes "under the belly" a bit) - moving the L and K a bit tailwards.