It's in the habitable zone - and simulations indicate it could have liquid water on the surface. However, it's a guess - we don't know for sure. We need to improve imaging greatly.
Or, you know, send an interstellar probe, but that won't call back for years if not decades.
Even if we could walk the surface of Proxima B, it would be a highly alien landscape. Because it receives less light in our visual range and more in the near-infrared - and almost none in the UV - plants would have to be very different. They would have to draw energy from the red light more and the UV less. And with less light energy in general, it is entirely possible that the plants on Proxima B would have to be black or perhaps dark gray - can anyone give me a better guess?
Oh, and it's tidally locked...
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