Hi hepdoll,
I think you might need to use larger source images for those two. The theme will re-size the portfolio images to width=465 height:346 but since they aren't tall enough to fit the proportion they just get kind shrunken down like that.
Alternatively, you can try opening your function.php file (in your theme files) and changing:
$avia_config['imgSize']['portfolio'] = array('width'=>465, 'height'=>346);
to
$avia_config['imgSize']['portfolio'] = array('width'=>465, 'height'=>346, 'crop'=>true);
Regards,
Devin