It's quite wonderful- I love it! And no, noone is upset or would be with explaining things. It's very cool to know other's beliefs, and why, and just be happy to hear these beliefs give them peace, you know? In point of fact, I rather wish less people would depict Jesus, since so many of the depictions tend to be rather-well- soupy,if you know what I mean. Plus- he's always painted with light hair and eyes,like a northern European, which is historically wildly inaccurate, being a Jew from that region, in that time- probably had dark hair, eyes and skin. I think it's nice to not have some actual image, but be able to imagine for oneself.
Very good to go with your intincts on the colors, too- it IS hard to describe why something feels right, isn't it? Yours works, too- I do like it a ton!
I'm not sure if canvas would fray or not- if it's stretched canvas, it's a little thin these days and might only slice like paper. Maybe if you sort of scrape it carefully, you could get that effect? Plus, if it is a stretched canvas, a rather large slice will collapse things a little. The old, GOOD stuff is out there somewhere, I'm sure, but have no idea where that would be. I generally paint on wood.