It looks like a good start.
Try adding details to the rest of the surfaces. Wherever you see a flat panel, try adding something to it. Maybe a simple extrusion, a set of boxes for vents, random shapes and designs, spheres for rivets and bolts, tubes, pistons, whatever you can think of!
The #1 Rule I leave myself when modeling is leave no face untouched.
Try and think of things you'd like to see in a texture, and model it onto the mesh.
Other than that, keep up the good work and practice practice practice!