\documentclass[10pt]{article}
\usepackage[paperwidth=8.5in, paperheight=11in, bmargin=0in,tmargin=0.5in,lmargin=0.5in,rmargin=0.5in]{geometry}
\usepackage{graphicx}
%\setlength{\parskip}{\baselineskip}

\begin{document}
\thispagestyle{empty}

\includegraphics[width=3in,height=5in]{tent_dog1.png}
\includegraphics[width=3in,height=5in]{tent_dog2.png}
\\
\includegraphics[width=3in,height=5in]{tent_dog3.png}
\includegraphics[width=3in,height=5in]{tent_dog4.png}

\clearpage

\includegraphics[width=3in,height=5in]{tent_archer.png}
\includegraphics[width=3in,height=5in]{tent_fmsword.png}
\\
\includegraphics[width=3in,height=5in]{tent_hobbit.png}
\includegraphics[width=3in,height=5in]{tent_dwarf.png}

\clearpage

\includegraphics[width=3in,height=5in]{tent_sword1.png}
\includegraphics[width=3in,height=5in]{tent_sword2.png}
\\
\includegraphics[width=3in,height=5in]{tent_sword3.png}
\includegraphics[width=3in,height=5in]{tent_sword4.png}

\clearpage

\includegraphics[width=3in,height=5in]{tent_spear1.png}
\includegraphics[width=3in,height=5in]{tent_spear2.png}
\\
\includegraphics[width=3in,height=5in]{tent_spear3.png}
\includegraphics[width=3in,height=5in]{tent_hammertime.png}

\clearpage

\includegraphics[width=3in,height=5in]{tent_goblin.png}
\includegraphics[width=3in,height=5in]{tent_torchy.png}
\\
\includegraphics[width=3in,height=5in]{tent_ferret.png}
\includegraphics[width=3in,height=5in]{tent_bear.png}

\clearpage

\includegraphics[width=3in,height=5in]{tent_blank.png}
\includegraphics[width=3in,height=5in]{tent_blank.png}
\\
\includegraphics[width=3in,height=5in]{tent_blank.png}
\includegraphics[width=3in,height=5in]{tent_blank.png}
\end{document}