Shortcode and variable

For anyone that comes across this in the future, here is what I figured out:

$askavl_instagram_contact_title = get_post_meta(get_the_ID(), 'askavl_instagram_contact_title', true);
if(isset($askavl_instagram_contact_title) && $askavl_instagram_contact_title != "") :
    $tag = str_replace("#","", ((string)$askavl_instagram_contact_title) );
    $thumbsize = "220px";
    $image_limit = "2";
    $easyInstagramSC = "[easy-instagram limit={$image_limit} caption_hashtags=false caption_char_limit=0 author_text="" thumb_click='thickbox' time_text="" thumb_size={$thumbsize} tag='{$tag}']";
    echo do_shortcode( $easyInstagramSC );

From what I can tell my error was in the concatenation. This is working, hoewever if someone knows a better solution I would like to improve this.