GBPJPY Short idea

The GBPJPY has been on a noticeable downtrend which I think is set to continue along the channel lines shown.
The colours of varying colour and intensity represent how likely it is that the GBPJPY will continue its decline.

Of course, there is the possibility that the pair will surprise me as always and go back up, and if it passes the red line, start preparing, and if the blue rectangle - I say go for it.

Thanks and please critique.