Hi,
This modification would allow you to get the picture:
<?php foreach ($user as $u) { ?>
<?php if($u["b_company"]==1) {?>
<tr>
<th>
<?php View::newInstance()->_exportVariableToView('user', $u);
profile_picture_show() ;?>
You need to use that function to get the correct extension of the uploaded picture.
Your problem here is that looks like you want to add a link and custom dimentions to the image, to achieve that you could modify the plugin itself, changing this line in index.php:
// This is the picture HTML code displayed on page
echo '<img src="'.osc_base_url() . 'oc-content/plugins/profile_picture/images/profile'.$user_id.$result['pic_ext'].'?'.$modtime.'" width="'.$maxwidth.'" height="'.$height.'">'; // display picture
Regards