Tikz/pgf is an excellent LaTeX package to draw pictures. It can be used in Emacs org mode. An example can be provided as follows.
,#+BEGIN_SRC latex :file FILE.png :imagemagick yes :headers '("\\usepackage{tikz}") :fit yes :iminoptions -density 600
\begin{tikzpicture}
tikz statements;
\end{tikzpicture}
,#+END_SRC