Looks generally ok, but I'd make some minor changes:
a) I'd "straighten" the refuelling probe (or at least made the upper and lower black contour to "step" in the same place) and I'd say that these tiny vertical "wings" at the base of probe have bitt odd shape right now,
b) (most important to me
) on the canopies there are places where "double black lines" appear - I'd modify the lines in such way that it wouldn't happen,
c) lower Mirage has rather "empty" upper surfaces of wings - I'd try to add some panel lines etc.
d) I'd make the wing-fuselage blending more pronounced - now it's in the same grey shade as any other panel line - I'd make the line darker and add shading)
e) on the Mirage IVA I'd add shad made by the wing on the fuel tank (are You sure, btw. that tank's diameter was larger in the rear than in front, as it looks so now?)
f) below the exhaust there is some "thing" below the fuselage - it makes double black line.