Beautiful shy type sea shell

I was down to the beach and something has beaten of my feet of the ground then I saw this beautiful creature. I get it then waiting for something to get of the shell, then I found a beautiful crab like creature. I waited for the best position ao that I can have a good capture of it and this is the outcome of my patience.

I dont what you call this. But all I know is that it is very beautiful and shy type crab.