first my example:
\documentclass[a4paper,abstracton]{scrartcl}
\usepackage{graphicx}
\usepackage{float}
\usepackage{lscape}
\usepackage{rotating}
\begin{document}
\section{Appendix}
%EXAMPLE #1
\subsection{Iteration 1 -- Prototyp}
\begin{landscape}
\begin{figure}[H]
\centering
\includegraphics[width=0.95\linewidth]{images/it2.pdf}
\end{figure}
\end{landscape}
\newpage
%EXAMPLE #2
\subsection{Iteration 2 -- Prototyp}
\begin{figure}[H]
\centering
\rotatebox{90}{\includegraphics[width=1.5\linewidth]{images/it2.pdf}}
\end{figure}
\end{document}
the result:
the problem (EXAMPLE#1): page one shows the heading and page two shows the figure. i want to display both on the same page. how can i realize this without hundred lines of source code?
the problem (EXAMPLE#2): blank page with additional confusing scaling.
similar questions have already been asked, but there is no appropriate solution to solve the problem smart. almost there are questions regarding tables, not figures.
thanks for support :)

landscapewill always clear a page before doing the stuff inside. Do you need a caption for that figure? – Johannes_B Oct 04 '14 at 10:31\iftrue\else \rotatebox{90}{\includegraphics{name}}– Johannes_B Oct 04 '14 at 10:38showframeto confirm. Please be aware, that a figure-environment always adds some vertical space. – Johannes_B Oct 04 '14 at 13:40