قرار دادن عنوان زیرشکلها در محیط tikzpicture

Question

با سلام و عرض احترام، در کد ارسالی هر کاری میکنم که کپشن های (الف)، (ب) و (پ) در زیر دایره‌ها قرار بگیرن نمیشه، به چه صورت میشه این کارو انجام داد؟

با تشکر فراوان

\documentclass[11pt,a4paper,twoside]{book} 

\usepackage[total={12cm,20cm},centering,includehead=true,paperwidth=14.5cm, paperheight=24cm]{geometry}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{subfigure}
\usepackage{xcolor}
\usepackage{tikz}
\usepackage{fancyhdr}
\fancyhead[RE,LO]{\bfseries\thepage}
\cfoot{}
\pagestyle{fancy}
\usepackage{xepersian}

\settextfont[Scale=1]{Yas}
\setlatintextfont[Scale=.95]{Times New Roman}
\setdigitfont[Scale=1]{Yas}
\defpersianfont\chapfont[Scale=3.3]{Yas}

\begin{document} 

\begin{figure}[!t]
\centering
\renewcommand{\thesubfigure}{(پ)}
\subfigure[]
{
\begin{tikzpicture}
\draw (2,0) circle [radius=0.7cm];
\draw[draw=red,thick] (2,0)--(2.7,0);
\fill (2,0) circle (1.3pt);
\draw (2.3,0.2) node{$t^{n}$};
\draw[scale=0.5] (4,0) node[below]{$f(z_{0})$};
\end{tikzpicture}\label{Figure3.2c}
}
\renewcommand{\thesubfigure}{(ب)}
\subfigure[{}]
{
\begin{tikzpicture}
\begin{scope}[>=latex]
\draw (0,0) circle [radius=1cm];
\draw[draw=red,thick] (0,0)--(1,0);
\draw[draw=blue,thick] (0,0)--({cos(120)},{sin(120)});
\draw[draw=green,thick] (0,0)--({cos(240)},{sin(240)});
\fill (0,0) circle (1.3pt);
\draw (1,0) node[right]{$t$};
\draw (2,0.8) node{$z^{n}+f(z_{0})$};
\draw[->,line width=0.9pt] (1.2,0.2) to [out=30, in=150] (2.2,0.2) ;
\end{scope}
\end{tikzpicture}
}
\renewcommand{\thesubfigure}{(الف)}
\subfigure[{}]
{
\begin{tikzpicture}[line width=0.9pt]
\begin{scope}[>=latex]
\draw (2,0.8) node{$a(z-z_{0})F(z)$};
\draw[->] (1.2,0.2) to [out=30, in=150] (2.2,0.2) ; 
 \draw[clip] plot[smooth cycle,variable=\t,samples at={0,45,...,315}] (\t:{1*(1+0.1*rnd)});
 \foreach \X [count=\Y starting from 0] in {red,blue,green!70!black}
 {\draw[\X] plot[smooth,variable=\t,samples at={0,0.25,...,1.75}] 
 ({15+6*(rnd)+120*\Y}:\t);
 }
 \end{scope}
\end{tikzpicture}\label{Figure3.2a}
}
\caption{رفتار موضعی یک تابع تحلیلی.}\label{fig3.2}
\end{figure}

\end{document}