\usetikzlibrary{decorations.markings}
\usetikzlibrary{arrows}

\begin{tikzpicture}

% draw axis
\draw[thick, ->] (-3cm, 0cm) -- (3cm, 0cm) node[anchor=south] (ascissa) {$\Re z$};
\draw[thick, ->] (0cm, -3cm) -- (0cm, 3cm) node[anchor=east] (ordinata) {$\Im z$};

% draw isolated point
\draw[fill] (-1.5cm, 1.1cm) circle [radius=2pt] node[anchor=south west] (w) {$w$};

% draw closed loops
\draw[dotted, decorate, decoration={markings, mark=at position 0.0 with {\arrow{latex}}}] (-1.5cm, 1.1cm) circle [radius=0.6cm];

% draw the names of the paths (use $\mathcal{C}$ instead of $\ccC$ if it does not compile)
\node (c0) at (-2.1cm, 0.3cm) {$\ccC_{(w)}$};

\end{tikzpicture}


% vim: ft=tex