imagem não aparece, ou quando coloco dentro da tag main a mesma aparece quebrada. | HTML5 e CSS3 I: Suas primeiras páginas da Web

Meu Html


<!DOCTYPE html>
<html>
    <head>
        <title>Portfolio</title>
        <meta charset="utf-8">
        <link rel="icon" href="favicon.png">
        <link rel="stylesheet" href="css/reset.css">
        <link rel="stylesheet" href="css/portfolio.css">

        <link rel="stylesheet" href="http://fonts.googleapis.com/css?family=Crimson+Text:400,400italic,600">
        <link rel="stylesheet" href="http://fonts.googleapis.com/css?family=Open+Sans+Condensed:700">
    </head>
    <body>
        <main>       

            <h1 class="titulo-principal"> Portfolio</h1>

            <div class="container">



           <figure class ="bmw" href="http://www.bmw.com"></figure>



            </div>

           </main>






        <img src="img/eu.jpg" alt="Foto de João da Silva" class="minha-foto">
        <aside class="navegacao-site">

            <h1>João da Silva</h1>
            <nav>
                <ul>
                    <li><a href="index.html">Home</a></li>
                    <li><a href="portfolio.html">Portfolio</a></li>
                    <li><a href="bio.html">Sobre mim</a></li>
                    <li><a href="blog.html">Blog</a></li>
                    <li><a href="contato.html">Contato</a></li>
                </ul>
            </nav>
            <ul class="icones-redes-sociais">
                <li>
                    <a class="github" href="https://github.com/joaodasilva">
                        Github
                    </a>
                </li>
                <li>
                    <a class="twitter" href="https://twitter.com/joaodasilva">
                        Twitter
                    </a>
                </li>
                <li>
                    <a class="linkedin" href="https://br.linkedin.com/pub/joão-da-silva/32/4/508">
                        LinkedIn
                    </a>
                </li>
            </ul>
        </aside>
        <footer class="rodape-pagina">
            &copy; João da Silva 2014
        </footer>
    </body>
</html>

Meu css

body {
    font-family: "Crimson Text", "Times New Roman", serif;
    background-color: #F2FFFC;
    font-size: 120%;
    line-height: 1.5;
}

h1, h2 {
    font-family: "Open Sans Condensed", "Arial", sans-serif;
}

.titulo-principal {
    text-align: center;
    background-color: #851944;
    color: #FFF;
    padding: 25px;
    border-bottom: 10px solid black;
    font-size: 60px;
    text-transform: uppercase;
}




.navegacao-site {
    text-align: center;
    background-color: #3C1D3D;
    color: #F2FFFC;
}

.rodape-pagina {
    background-color: #000;
    color: #F2FFFC;
    clear: both;
}



.navegacao-site a {
    color: inherit;
    font-family: "Open Sans Condensed", sans-serif;
}

.citacao-bio, .navegacao-site, .rodape-pagina {
    padding: 20px;
}



strong {
    font-weight: bold;
}



.icones-redes-sociais li {
    display: inline-block;
}



.icones-redes-sociais a {
    width: 40px;
    height: 40px;
    display: block;
    text-indent: -99999px;
}

.github {
    background-image: url(../img/github.png);
}

.twitter {
    background-image: url(../img/twitter.png);
}

.linkedin {
    background-image: url(../img/linkedin.png);
}

main {
    float: left;
    width: 85%;
}

aside, .minha-foto {
    float: right;
    box-sizing: border-box;
    border-left: 10px solid black;
    border-bottom: 10px solid black;
}



.minha-foto {
    position: absolute;
    top: 0;
    right: 0;
}

.navegacao-site {
    width: 15%;
    position: relative;
    top: 310px;
}

.rodape-pagina{
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;


}

.container, .bmw
{

 background-image: url(../img/bmw.png);
 position: relative;
 top:50px;

}

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