Though the costume may not be spectacular, I really like the mask. It's possible to find these in fairly good condition without to much warping or tearing. The likeness is quite good and I love that they included the blue eye shadow that is often omitted from Nimoy/Spock likenesses.
If you compare the top and bottom images you'll see the bottom one has a punched hole in the mouth where the top one does not. Either the top one is there and hasn't been punched out or there was a second run of this costume which added the hole for better breathing. I guess it would be bad to have kids suffocating to be Spock.