Insert this into wrapper.php (line ~420) after
"// get picture infos (original)"  and before
"// determine display width"
                if(exif_imagetype($filesystem_current_path . $file) == 2) {
                    $current_picture['info']['exif'] = exif_read_data($filesystem_current_path . $file, 0, true);
                    if($current_picture['info']['exif']['EXIF']['DateTimeOriginal'] == "") {
                        $current_picture['info']['exifexists'] = 0;
                        }
                    else {
                        $current_picture['info']['exifexists'] = 1;
                    }
                }

Then under you template directory in "viewpic.tpl" add the following after (line ~62) which reads
<div class="description">{$arrCurrentPicture.description}</div>
{/if}

                        {if $arrCurrentPicture.info.exifexists}
                        <table class="exifinfo">
                            <tr>
                            <td>
                                <div class="exif_tag_name">
                                    Make:<br>
                                    Model:<br>
                                    FileName:<br>
                                    DateTimeOriginal:<br>
                                    ExposureTime:<br>
                                    ISOSpeedRatings:<br>
                                    FocalLength:<br>
                                    FNumber:<br>
                                    ExposureBiasValue:<br>
                                    WhiteBalance:
                                </div>
                            </td>
                            <td>
                                <div class="exif_tag_data">
                                    {$arrCurrentPicture.info.exif.IFD0.Make}<br>
                                    {$arrCurrentPicture.info.exif.IFD0.Model}<br>
                                    {$arrCurrentPicture.info.exif.FILE.FileName}<br>
                                    {$arrCurrentPicture.info.exif.EXIF.DateTimeOriginal}<br>
                                    {$arrCurrentPicture.info.exif.EXIF.ExposureTime}<br>
                                    {$arrCurrentPicture.info.exif.EXIF.ISOSpeedRatings}<br>
                                    {$arrCurrentPicture.info.exif.EXIF.FocalLength}<br>
                                    {$arrCurrentPicture.info.exif.EXIF.FNumber}<br>
                                    {$arrCurrentPicture.info.exif.EXIF.ExposureBiasValue}<br>
                                    {$arrCurrentPicture.info.exif.EXIF.WhiteBalance}
                                </div>
                            </td>
                            </tr>
                        </table>
                        {/if}

Lastly in the css directory under your template dir in the file "style.css" add something like the sort

.exifinfo {
        border-width:1px;
        border-style:solid;
        background-color:#333333;
        border-color:#444444;
        padding:10px;
        margin-top:20px;
        margin-bottom:20px;
        text-align:center;
        width:300px;
}

.exif_tag_name {
        text-align:right;
        font-weight:bold;
        padding-right:5px;
}

.exif_tag_data {
        text-align:left;
        padding-left:5px;
}

-------------------------------
Of course this will only work if EXIF support is enabled in you php