Homemade Limoncello / Grapefruit Cello?

If you ever need a self styled expert opinion on grapefruit cello I'm your guy. :)
 
Hi all, I finished up a batch of Limoncello last night. It's good however, since I've never had any prior I'm unsure if mine tastes how it should. Should it be very sweet with a hint of lemon and a lot of alcohol? or should it be more tart with a lot of alcohol?
 
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