The photo doesn't center when using \centering

Question

I just saved an .eps file that it can not be uploaded to latex and it shows as in the photo , how would I resolve it ? this is the code , when I use smaller dimensions it's in the center , but with this one , I increased a little bit , and it went out of the center

\begin{figure}[H]
\centering
\label{fig:f419}
\caption{Deflection and weight as functions of D11 and D12}
\includegraphics[width=15cm, height=8cm]{4-23.eps}

\end{figure}

also this is my main file codes , that I don't know how to make a minimal , I mean , I know the link to minimal but here it's just too much and confusing

\documentclass[11pt,a4paper,twoside,openright]{report}

\usepackage{setspace}
\usepackage{graphicx}
\usepackage{tabularx}
\usepackage{tabu}
\usepackage{subfigure}
\usepackage{afterpage}
\usepackage{amsmath,amssymb}            
\usepackage{rotating}  
\usepackage{fancyhdr}  
\usepackage[scriptsize]{caption} 
\hyphenation{a-gen-tiz-za-zio-ne}
\usepackage{float}
\usepackage[parfill]{parskip}
\graphicspath{ {images/} }

\setlength{\paperwidth}{16cm}
\setlength{\paperheight}{24cm}
\setlength{\oddsidemargin} {2. cm}
\setlength{\evensidemargin} {2. cm}
\addtolength{\oddsidemargin} {-0.4 cm}
\addtolength{\evensidemargin} {-0.4 cm}
\linespread{1.1}

\usepackage[USenglish]{babel}
\usepackage[latin1]{inputenc}
\renewcommand{\captionfont}{\normalfont \sffamily \itshape \small}

\pagestyle{empty}


\begin{document}


\include{frontespizio}
\thispagestyle{empty} \normalfont \cleardoublepage
\include{dedica}
\thispagestyle{empty}  \cleardoublepage
\pagenumbering{Roman}
\include{sommario}
\thispagestyle{empty} \vspace*{.75truecm} \cleardoublepage
\include{ringraziamenti}
\thispagestyle{empty} \vspace*{.75truecm} \normalfont \cleardoublepage
\pagestyle{plain}\renewcommand{\chaptermark}[1]{\markboth{\chaptername\ \thechapter.\ #1}{}} 
\renewcommand{\sectionmark}[1]{\markright{\thesection.\ #1}}         
\fancyhead[LE,RO]{\bfseries\thepage}    

\fancyhead[RE]{\bfseries\leftmark}    
\fancyhead[LO]{\bfseries\rightmark}     
\renewcommand{\headrulewidth}{0.3pt} 

\include{capitolo1}
\include{capitolo2}
\include{capitolo3}
\include{capitolo4}
\include{capitolo5}
\include{capitolo6}
\include{capitolo7}

\cleardoublepage
% ---- Bibliography ----
\addcontentsline{toc}{chapter}{Bibliografia}
\bibliographystyle{plain}
\bibliography{bibl_tesi}
%\nocite{*}

\appendix

\pagestyle{fancy} 
\fancyfoot{}                                               
\renewcommand{\chaptermark}[1]{\markboth{\appendixname\ \thechapter.\ #1}{}} 
\renewcommand{\sectionmark}[1]{\markright{\thesection.\ #1}}         
\fancyhead[LE,RO]{\bfseries\thepage}    

\fancyhead[RE]{\bfseries\leftmark}    
\fancyhead[LO]{\bfseries\rightmark}     
\renewcommand{\headrulewidth}{0.3pt} 

\renewcommand\bibname{references}
\tableofcontents\addtocontents{toc}{\protect\thispagestyle{empty}}\newpage
\renewcommand\listfigurename{list of figures}\listoffigures
\renewcommand\listtablename{list of tables}\listoftables

%\phantomsection\addcontentsline{toc}{chapter}{list of symbols}\input{FrontMat/Symbols}


\include{appendiceA}
\include{appendiceB}
\include{appendiceC}
\include{appendiceD}
\include{appendiceE}
\include{appendiceF}
\include{references}
\end{document}

Answer 1

Here's a guess at what you might want, after minimising your example:

\documentclass[11pt,a4paper,twoside,openright]{report}

\usepackage[demo]{graphicx}
\usepackage{float}
\usepackage[scriptsize]{caption}

\usepackage[textwidth=160mm, textheight=240mm, hmarginratio=1:1, showframe]{geometry}

\pagestyle{empty}

\begin{document}

  \begin{figure}[H]
    \centering
    \caption{Deflection and weight as functions of D11 and D12\label{fig:f419}}
    \includegraphics[width=15cm, height=8cm]{4-23.eps}

  \end{figure}

\end{document}