few things to make it more realistic looking,
you need to make like 4x the ammount of keys as it looks like a whack a mole game atm, the fingers need to look less static looking right now the person looks like there getting electrocuted,
the organ should have more shape to it currently it looks like a rectangle with rounded edges.
the person could do with a texture, or perhaps a more detailed one, like seams in the robe and maybe more defined creaces, the clothes look like they should be more baggy asif they were draoped over the persona arms and legs. the organ pipes look pretty much correct maybe some flaws in the texture so it doesnt look like a perfect just moulded pipe.
dont get me wrong its nice but if you want it to truley look more professional then you should follow some of my pointers.