The art itself - technique-wise - is awesome. I certainly can't see any problems with it. The colors and lines are clean and certainly seem to achieve the effect you're shooting for. Once I read that you were using your own hands as a reference, it did start to look to me (unfortunately) like a man's hands on a woman's body, but that's hard to correct, and probably just me thinking too hard about it. I certainly wouldn't have thought so unless told.
One thematic nitpick I do have is that she's holding the sword the wrong way. I studied Kendo for a fair number of years, and regardless of handedness, when using Japanese blades (as the reference material is pretty obviously a katana) the left hand should always be gripping the pommel area of the hilt tightly, and the right hand holds the grip close to the handguard more lightly, like so:

The strength and 'chopping-power' of the sword is carried by the left arm, and gripped most tighly with the pinkie finger of the left hand (Which is why in disgrace, traditionally, members of the Japanese mafia have their left pinkies cut off). Even southpaws are taught to hold the sword in this manner, so someone who has some swordfighting knowledge is likely to pick up on this pretty quickly.
Even in wakigamae - the low stance where the blade is held horizontally to the side/behind the body, this is maintained:

Of course, as it's a piece of art, it's not like you need to be 100% accurate, but I thought I'd point it out.
One thematic nitpick I do have is that she's holding the sword the wrong way. I studied Kendo for a fair number of years, and regardless of handedness, when using Japanese blades (as the reference material is pretty obviously a katana) the left hand should always be gripping the pommel area of the hilt tightly, and the right hand holds the grip close to the handguard more lightly, like so:

The strength and 'chopping-power' of the sword is carried by the left arm, and gripped most tighly with the pinkie finger of the left hand (Which is why in disgrace, traditionally, members of the Japanese mafia have their left pinkies cut off). Even southpaws are taught to hold the sword in this manner, so someone who has some swordfighting knowledge is likely to pick up on this pretty quickly.
Even in wakigamae - the low stance where the blade is held horizontally to the side/behind the body, this is maintained:

Of course, as it's a piece of art, it's not like you need to be 100% accurate, but I thought I'd point it out.