Somethimes muscles tension are hard to define.

 One is displaying vertical glabellar wrinkle is very visible, and eyebrows muscles tension is easy to catch. But chewing muscles or pterygoid ,and with muscles ,rising  a top lip, cheek, and they are lie in more deeply layers,theirs micro mobility of eyes are not visible on first, deformations on a face of hyper tone  are not visible.And a most often forehead tension is on a face is not visible, but tension changing lips forms and creates wrinkle a chin and lip, and unevenness in this region. Thus in work with a face you need to attend are on the wrinkles with a visible reasons, and face severity.As very disgustedly sad

in a tension of triangle muscle and corners of mouth omission. As disgustedly sad in nose tension and muscles,rising a lip top.And if these changes are having and still not visible and not lead to the deep wrinkles and grins,thus you has a chance to fix situation with massages, tapes,changing mimic habits and neck static.