Clasping one's hands together is a common cultural courtesy with the Chinese people. Non-verbal signs of respect in particular has a long and pretty varied history. The "kung fu" salute with the right fist pressed against a straight open left palm is one such.

Various ruling classes, dynasties, and even provinces have had different ways of communicating using their hands. The particular hand gesture you've shown is a humble sign of respect, similar to the more well-known kowtow. However, the kowtow is almost solely reserved to the Emperor and his representatives. As such, "lesser" forms of giving respect exist, and this is probably one such form. I haven't seen any records that mention this particular pose, so it could be fictional, but through the body language you can get the gist of the idea. Judging from the bowed posture, the raised clasped hands, and the blocking of the eyes with the hands, you can assume it's a rather formal gesture of respect to a high-ranking entity.

The most recent information regarding Imperial Chinese formalities comes from the reports compiled by Westerners visiting China. When visiting the imperial court, Dutch ambassador Isaac Titsingh, and other Dutch diplomats including Andreas Everardus van Braam Houckgeest and Chrétien-Louis-Joseph de Guignes, conformed with imperial etiquette and also observed what they saw in detail. You might be interested in taking a look at their writings:

Reference: van Braam Houckgeest, D.A.E., 2008. Andreas Everardus Van Braam Houckgeest, or the Optimistic Adventures of a Dutchman in China. Review of culture, (28), p.87.