Yeah, there's not much of another way to do it unfortunately. Not from what I've seen anyway.
Personally though, my biggest gripe is the legs. I'm sorry, I just can't see how they'd move, they're in a very stiff and awkward position. Which I think is largely because you've designed them a bit funny. Seems like you aimed to match the older pictures of Pinsir, but his legs have undergone a bit of a design change.. I think in gen 3? I'm not sure, it's hard to tell from the sprites. Using
this image as a reference;
This seems to be the new style they're going with. Ovular, with a rod connecting it to the body instead of being attached itself. The leg is still very close to the body almost touching it, but not quite [might be wrong there, I had a horrible time finding an image of Pinsir from the front, so I guessed a bit just based on the fact that there's a connector rod]. It also has a pair of sockets the legs can fit into near the bottom [which is why I've added those curves to it]. Figured I'd point that out since you're redoing the body anyway so it'd be a good thing to keep in mind.
Rest of the model is looking good though, you've nailed every detail, and I'm personally looking forward to seeing the newly designed teeth [and hopefully legs] :3 Keep it up friend.