Nice Jade
One thing though, your cast shadows from the wing and tail are way too sharp and simple. Your plane will look much more realistic with a few easy fixes.
First off, your reference photo tells you something very important about the nature of light and the way it casts shadows. The further away from the object casting the shadow, the softer the edges of the shadows get, and also less intense. This is always true. The amount of softness and intensity depends on how strong the light is of course.
Your cast shadows under the wing and tail are of equal intensity and sharpness. Take a look at the way the shadow falls on the tail of your reference photo. See how it gets softer both in it's edges and it's darkness as it stretches away from it's source?
You don't need to go crazy with this though, just enough to see that it's happening. I trust your shadows are on a separate layers? If so, take a really soft fairly large eraser set to a low percentage, maybe 10%. Take a pass and the lower half of your shadow and see how it looks. You might need to do several passes of course. Then whip out your blur tool and fuzz the edges as they recede. Same thing with the shadow of the prop, shadows from the wing on the gear doors and radiator housing.
The other thing that needs to be done with shadows is to have them follow the contour and relief of the objects. The only place lacking on your profile is the tail wheel. The shadow from the fuselage is being cast over a round tire, a hub with many raised and recessed details, and the gear forks that wrap around the wheel.
Your lighting will look much more realistic if you work on these areas.
Otherwise, excellent work
