Your problem with the icon outline comes from the fact that the alpha channel differs from the RGB. It appears that the outline is drawn with pre-multiplied alpha in the task bar which makes the RGB show additively, while the button in the ship view window uses normal alpha blending so the alpha channel determines what's visible. You can fix this by just making sure the outline is the same in both RGB and Alpha. (The one in the alpha channel seems more correct in that it looks the same way as all the other ships)
Nice ship btw
Some problems:
- the frames are too tightly packed together, so you tend to see filtering errors on the rear side of the ship (a flickering line that's basically the tops of the gun & icon frames)
- the ship graphic is perhaps too large for a ship this small. You'll never see it in full size in combat so the detail is lost. This also contributes to the error above.
- the gun turrets and glows need some work, they look strangely "8-bit" on the more realistic looking ship.