@ABetterName
Ok, going from tail towards nose:
(and here's a small reference - I don't really know how accurate it is, it's merely for the purpose of comparison/reference:
http://www.airwar.ru/image/idop/cw1/tri ... tor5-1.gif )
-tail wheel - ok, the wheel is round now, but the struts/oleos etc. on your drawing look like a single piece of metal, which
clearly is not the case;
-strut under the horizontal stabilizer - it's all "shaded" since the visible surface is downwards (so the shade made by stabilizer on fuselage doesn't apply to it that way);
-contour of the bottom of rear part of fuselage - it should be either a curve or straight line (rearwards) turning into curve towards nose (so the length of subsequent "steps" of black line should be regularly rise) while yours is effectively a zig-zag with random lengths;
-shade of the bottom fuselage - shade on fuselage (engines etc.) is used to show their rounded shape - fuselage of Tri-Motor is rounded only on top, so only on top there should be lighter shade, but bottom is square-ish, so no shading there is needed (or - at most, if there actually is some minimal rounding there, 1 pix-thickness would suffice);
-another thing - here's the picture from Style Rules:
Your drawing is littered with that error, particularly on engines, over the cockpit and on wings;
-contour of the wings - basically similar problem as with rear/bottom fuselage;
-try to work on the diagonal strut supporting underwing engine;
-I believe that both the detailing of the engine pods and shape of exhausts was more sophisticated;
-strut from the main wheel to the fuselage (that one running at an angle) should be of even width and yours isn't;
-the central (metal) part of the main wheel should be round too, not square-ish, and generally I'd say that the landing gear begs for more attention to details;
-huge thing - we don't like 2-pixel thick lines and even less we like 3-pixel line ones - like the propellers - between contours there should be some other color (black-grey-black for example);
-I don't really like the way the cockpit windows are done;
-detailing of the central engine - same as with underwing engines;
-that "chin" below/behind the fuselage engine isn't the chin - there should be an exhaust.
@Radome, Nighthunter
Fantastic work!