Well, for the beginning, the fuselage wouldn't be covered in metal, but with wood and canvas (and even if it were covered in metal, it would be in a different manner). Secondly, the wings wouldn't have the same thickness from the leading to trailing edge. Thirdly, both ends of fuselage, as well as both ends of "superstructure" are rounded (like vertical cyllinders) so should be shaded accordingly. Tires wouldn't be brown, but more grey-black. And You could work more on these bombs.
![Wink ;)](./images/smilies/icon_e_wink.gif)