The "nervous grin" tag and its variations

I noticed there are four tags meaning the kind of smile when one is trying to hide embarassment, nervousness, guilt or other feelings in this vein.
 
Those tags are:  

Bumping it up. ;)

Bumping it up again. ^^

I’ve aliased the nervous tags.  
I would argue awkward/sheepish are different enough from nervous to retain there own tags, though should probably be aliased with themselves. IMO, “sheepish grin” would be the best representation of the two if they were to be aliased.