Need help with images in wp php code

Hi guys,
a blonde needs help with editing php code in a Wordpress theme.

I've got the following code <img class="featureimg" src="<?php echo get_post_meta($post->ID, "Side Photo", true); ?>" alt="" />
When I put img url after src= nothing happens. Do I have to insert something after alt= ? How do I do it work.
Thanks and sorry for a silly question.

 

Write here the code which doesn't work. And if you can write here the url too.

 

thank you for answering, already resolved it.
btw Art Works Expo is a nice idea)

 

Thank you lavanda!