Great job!
If you would like some constructive criticism! There shouldn't be a stencil on the lower cooler housing on the starboard side (cowl doesn't hinge that way so not needed!) Both intake scoops should be the same size and design on the cowl. There should be a hole for the starter handle on the starboard side cowl and the oil dilution cover on the cowling should be there too, no cowling latches? they are quite noticeabley absent. A minor point is the slats would most likely be out at that point. What is the dot behind the oil cooler on the belly? Being extremely picky now (so disregard as needed) the starboard soot pattern on the 109 is quite different to the port side, it looks like you have drawn the port side pattern on the starboard, the starboard pattern is in a large arc that is quite different! You get to notice these things if you have too much free time!
I haven't an artistic bone in my body so congratulations on your work it is most impressive!
Check out this site for original photos
http://www.bf-109.de/