Full electron propagator in latex

Ok, to give you a start, have a look at the tikz-feynman-package.

The following code should get you started:

documentclass{standalone}

usepackage[compat=1.1.0]{tikz-feynman}
usetikzlibrary{patterns}

begin{document}
tikzfeynmanset{
    every blob={
        draw=black,
        pattern color=black
    },
}

feynmandiagram[horizontal=a to b] {a -- [fermion] b [blob],};

end{document}