I match the viewpoint of the boat and the angle of the sun. Figure 4 seem to best match the photo.
Fig. 1. Wing deflector, Blauschwarz 58/2.
Fig. 2. Wing deflector, Black, surface roughness 15%.
Fig. 3. Wing deflector, Black, surface roughness 20%.
Fig. 4. Wing deflector, Black, surface roughness 30%.
Fig. 5. Wing deflector, Black, surface roughness 40%.
Fig. 6. Wing deflector, Black, surface roughness 50%.