\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{shapes,arrows.meta,positioning}

\begin{document}
\begin{tikzpicture}
    % Unicorn body
    \draw[rounded corners=2mm, fill=white] (0,0) rectangle (3,2);

    % Unicorn head
    \draw[rounded corners=1mm, fill=white] (3,1.5) rectangle (4,2.5);
    \draw (4,2.5) arc (180:270:1);
    \draw (4,2.5) arc (180:90:1);

    % Unicorn legs
    \foreach \y in {0.3,1.7}{
        \draw[line width=1mm] (0.6,\y) -- (0.6,\y-0.8);
        \draw[line width=1mm] (2.4,\y) -- (2.4,\y-0.8);
    }

    % Unicorn tail
    \draw[line width=0.8mm] (0,1.5) to[out=180,in=90] ++(-0.5,-0.5);
    \draw[line width=0.8mm] (0,1.5) to[out=180,in=90] ++(-0.3,-0.8);
    \draw[line width=0.8mm] (0,1.5) to[out=180,in=90] ++(-0.1,-1.1);

    % Unicorn horn
    \draw[line width=1mm] (3.7,3) -- (3.7,2.5);

    % Unicorn eye
    \fill (3.5,2.25) circle[radius=0.05];
\end{tikzpicture}
\end{document}