in order to create the tentacle look like thing, firstly set the foreground color e1ab29 and the background 857011,...and then go to brush presets to follow the settings as shown :
step 2 of 5
step 3 of 5
step 4 of 5
remember to always give tries the fade control with various number like 25- 150 and change the size of the brush accordingly...
step 5 of 5
after creating the "tentacle", go to filter > render> lighting effect as shown :