Are there mirrors in boundless?
Nah, there are no mirrors from what I understand and I"m not sure if there are any plans for them, you might want to ask a more knowledgeable player.
Do reflections from the water count as mirrors
You can’t see yourself - nor in portals showing the same location that should be able to see you. That is on the long list of to dos but there is also an issue that first person and third person are somewhat different, e.g. your hands wont be perfect mirror position.