Image not showing using a custom function and get_post_meta

UPDATE Ok, thanks to all for helping me out and pointing me in the right direction. I do have some code clean up to do and a possible all out change in code but I’ll use this for now.

I got it to work with the following code.

//El display image
function el_display(){
    global $post;
    $eldisplay = get_post_meta($post->ID, '_cmb_el_theme', true);
    $elcustomdisplay = get_post_meta($post->ID, '_cmb_custom_image', true);

        if(!empty($eldisplay)){
            echo '<img src="' . $eldisplay . '" />';
                }elseif(!empty($elcustomdisplay) && isset($elcustomdisplay)){
                echo '<img src="' . $elcustomdisplay . '" />';
            }else{
                echo '<img src="' . EL_IMG . 'mobile-development.jpg' . '" />';
            }
}

Thanks again!