First it depends which program are you using.
Zortam Mp3 Media Studio uses for saving tags and pictures officially ID3v2.3 standard defined at http://www.id3.org for saving pictures implemented through Id3Lib library(Id3Lib Library). So every picture that is saved from Zortam Mp3 Media Studio should be visible without any problems, because Zortam Mp3 Media Studio supports officially ID3v2.3 standard defined at http://www.id3.org