I'd like to create a contour diagram based off the following template
\documentclass[pstricks,border=12pt]{standalone}
\usepackage{pstricks-add,pst-eucl}
\psset
{
PointName=none,
PointSymbol=none,
linecap=1,
linecolor=red,
}
\def\Radius{1.8}
\def\radius{0.5}
\def\Angle{2.5}
\begin{document}
\begin{pspicture}[showgrid=false](-3,-3)(3,3)
\psaxes[labels=none,ticks=none,linecolor=gray]{->}(0,0)(-3,-3)(2.7,2.7)[$\textbf{Re}\, z$,-90][$\textbf{Im}\, z$,180]
\pstGeonode
(0,0){O}
(\Radius;\Angle){A}
(\Radius;90){B}
(\Radius;-90){C}
(\Radius;-\Angle){D}
(\radius;0|D){E}
(\radius;0|A){F}
\pstArcOAB[arrows=->,arcsepB=-3pt]{O}{A}{B}
\pstArcOAB[arrows=->,arcsepB=-3pt]{O}{B}{C}
\pstArcOAB{O}{C}{D}
\pstLineAB[ArrowInside=->]{D}{E}
\pstArcnOAB{O}{E}{F}
\pstLineAB[ArrowInside=->]{F}{A}
%labeling
\psset{labelsep=2pt}
\uput[45](\Radius;45){$\Gamma$}
\uput[135](\radius;135){$\gamma$}
\uput[-45](\Radius;0){$R$}
\uput[-135](\Radius;180){$-R$}
\end{pspicture}
\end{document}
which I borrowed from this post. The problem is the font is too big. Is there a way to set the fontsize/family globally so that it would apply to the entire file?
Actually, one more question: I'd like to use \psComment for annotations, but I wasn't able to figure out how make multiline annotations. Would appreciate any help.

\parbox, as in\psComment[ref=l,angleA=180](1,-1)(0,0){\parbox{4cm}{\large Origin \\ more text}}[\ncdiagg]. – Gonzalo Medina Jun 18 '15 at 01:00