When using the blender node with a mask, you want to set the blending to 1 and then plug the mask image into that. A blending value of 0 uses the top input only. A blending value of 1 looks at the bottom. Setting it to .5 will mix both. When you plug in a mask node, the white is equal to the value set and the black is 0.

Try:

You can also try using cycles nodes. The glossybsdf node might give you a sharper reflection than the reflect node.

I switched to the mixclosure node to show you how you would set that up if you want to try that. You can use continue using the blender node instead. It will work the same with the cycles nodes.

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