@Orionfield
747... from tail to nose...
1) Flag - why it's edges are so ragged? And why stripes are of different of width? If a flag with correct amount of stripes would be too big, just reduce number of stripes (but in this case IMHO it's perfectly possible to fit them all, each of equal 2-pixel width). And that lion... (that looks bit like a bull seen 3/4 en face, standing on hind legs...)
2) Tail logo - why are the outlines so ragged again? And btw. this logo is symmetrical, so you could just draw a nice outline of half of it, copy it, invert that copied part and join them together, then superimpose that on the drawing of a plane. (right now left and right half don't match)
3) Shape of that blue stripe just above the horizontal stabilzer is just ugly. And the arc over the registration could be made nicer too.
4) LETTERING! Only letters that look ok are those in the "Luxembourg" above the nose gear door. And those in "Cargolux" and "Not without my mask" are just plain horrible. For example letter "o", if cut in four pieces, then each piece if appropriately inverted should match every other piece. Here there's nothing of it. And for example lettre "x" - don't know what graphics editor you use, but does it permit to draw a straight line from point A to point B?
General advice - sometimes you just have fill or remove single pixels one by one to make shapes smoother (for example if you have some name like this one - copied from somewhere and resized to appropriate size, it will be distorted, so needs to be corrected - MANUALLY)
5) Stars on EU flag - well... what I just wrote about letter "o"?
6) That lion below big "O" looks like some insect with big abdomen but no tail.
7) "Face mask". To begin with, the color difference between background and the white elements of mask are barely visible (well, practically not visible at all) - only that
would notice, that this plane isn't actually white, but light grey. And the mask actually has a darker outline.
And why in the first place there's such small contrast between "brighter" and "basic" shade of the airplanes mine color (that "white that should be grey") and so enormously huge contrast between "basic" and "darker" shade?
https://en.wikipedia.org/wiki/Flag_of_L ... mbourg.svg
And also there are two small postscripts to DC-3 and Y-10.
https://www.google.co.uk/search?q=747+c ... 5&biw=1272