Latex - Beamer

Nice overview of common layout templates [1]

Freely positioned text/picture via textblock

\usepackage[
absolute
,overlay
%,showboxes
]{textpos}
% set unit of measurement
\setlength{\TPHorizModule}{1mm} \setlength{\TPVertModule}{\TPHorizModule}
...
\begin{textblock*}{4cm}[1,1](118mm,50mm)
 % {4cm} -> width of block
 % [1,1](118mm,50mm) -> right bottom of box at coordinates 118mm,50mm  % note: page = 128mm x 96mm
\includegraphics[width=4cm]{plot/sim_Fermi-DOS-Es-OSC.png}
\end{textblock*}