\usepackage[export]{adjustbox}
\LetLtxMacro{\OldIncludegraphics}{\includegraphics}
\renewcommand{\includegraphics}[2][]{\OldIncludegraphics[max height=6cm #1]{#2}}

\renewcommand{\floatpagefraction}{.8}%

\usepackage{titlesec}
\newcommand{\sectionbreak}{\clearpage}