<p:fileUpload id="related_image" fileUploadListener="#{fileUploadController.handleFileUpload}"
        mode="advance"
        auto="false"
        showButtons="false"
        sizeLimit="100000"
        fileLimit ="1"
        allowTypes="/(.|/)(gif|jpe?g|png)$/"
        style="width: 310px"/>

#some_prefix_id3a your_file_upload_component_id .someClass{
    display:none;
}

#your_file_upload_component_id .someClass{
    display:none;
}

#your_form_id .someClass{
    display:none;
}

#related_image .start{
    display:none;
}

$("#related_image .start").hide();

#related_image .cancel{
    display:none;
}

$("#related_image .cancel").hide();

#related_image .progress{
    display:none;
}

$("#related_image .progress").hide();