Definitely on the right track, especially the second shot. The first shot feels spatially a bit crammed. I think you could move the camera a bit further back, and separate the two so that there is a bigger gap between them.
I like how the bipedal guy sticks his spikes out, but the crab is kinda looking at the guy but not really, and then in the second shot he turns around to face the spikey guy.
It could be more interesting to have the first shot be in the middle of the fight. So imagine they were already fighting and either the spike guy or crab tried to kill the other one and we cut to your first shot where one of them is just finishing that attack or recovers from it. Right now the crab guy doesn't really do much at the beginning of the first shot. So it feels a bit like: "Aaaand action crab guy! Move!"
I would try to add something more dynamic in terms of relation ship. And you can go further with that in the 2nd shot. When the crab guy attacks, the spikey guy just walks backwards. What if they would interact more. Maybe the spike guy charges the crab at the same but then gets pushed back. He then recovers and takes a swing at him. Maybe when he gets pushed back, he's holding on to the two horns below the jaw of the crab.
What do you guys think?