LaTeX: Draw Smiley using TikZ package

Download and install Basic MiKTeX 64-bit Installer from
http://miktex.org/download

Start Menu > MiKTeX > TeXworks

Name and save the empty new file as texworks_smiley.tex

Write code below:
{
\documentclass[12pt,a4paper]{article}

\usepackage{tikz}

\begin{document}

\begin{figure}[H] %Here placement specifier

\begin{center}

\begin{tikzpicture}

\filldraw[fill=yellow,draw=black,very thick] (0,0) ellipse (3cm and 4cm); %draw face

\fill[black] (-1,2) ellipse (0.5cm and 1cm); %draw left eye

\fill[black] (1,2) ellipse (0.5cm and 1cm); %draw right eye

\draw[black,very thick] (-2.1,0) arc (225:315:3cm); %start point from (-2.1,0), radius is 3cm, starting angle 225 degree

\end{tikzpicture}

\end{center}

\end{figure}

\end{document} 

}

Toolbar >  Typeset of play icon
or
Hit Ctrl+T to execute and typeset the LaTeX code

Output:
☺