Without seeing the actual shot you are working with I can't give you the easiest solution but this should give you some ideas. The most efficient workflow depends entirely on the shot. The total roto work took about 2 minutes. I did a similar project the other day and there were only about 15 frames where the replacement surface was occluded by somebody's hand and there was little camera movement so I just added an orange solid that was about a half second long above the replacement layer, changed the blend mode to screen so I could easily see through the layer, temporarily turned off the replacement layer so I could see the hand below, moved the CTI to where the finger movement changed direction, drew a mask, moved to in point of the solid and adjusted the mask, moved to the out point of the solid and adjusted the mask, added one additional keyframe to fix a small tracking problem, then turned on the replacement layer and adjusted the feathering on the mask a bit to give me a little light wrap around the finger to complete the composite. You could even generate a matte layer in Mocha and export that to use as a track matte for the replacement layer. You could pre-compose the watch face layer and then animate the mask, but actually doing the roto on the watch face layer is the least efficient way to do the roto. You could duplicate the footage layer, put the duplicate on top and then mask just the finger, You could add a colored solid above the watch face layer, change the blend mode so you can see through the layer and then animate a mask on the solid then use it as a track matte for the watch face layer. There are dozens of other ways to work out a solution. When I need to do roto and am using corner pin I usually prefer this method because it gives you a much bigger canvas to work with and stabilized everything so there are a lot fewer keyframes for the mask. Just drawing a mask on a corner pinned layer is not going to work because the mask is applied before the transformation effect from corner pin.
It looks like you are using corner pin tracking from Mocha.
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