No, I love the comments and advice, so never fear giving it.
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I think I'll keep pretty close to the cushion shape I have now, though. Based on my reference images, and more importantly, on my real-life experiences, it's actually quite close to an accurate shape. What you have is a board with the top wrapped in very slightly padded leather, so the corners are pretty pronounced. That said, I think rounding those corners might look more natural to people, so I'll add some rounding to them, but not a lot. I might 'puff out' the top a bit, and maybe add some deformations, but again, in life those cushions are pretty flat and, let's be frank, unforgiving.
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When I was a boy (yes, long ago), our church still used a kneeling bench and communion rail, and I recall to this day that the padding was by no means plush. So, the boxy shape stays, but is softened along the top corners (the bottom corners are gonna stay sharp, where the leather is turned over them with no padding at all there). I will for sure though try to work on the texturing. Thank you for the great advice!
I use Photoshop CS4, by the way. For the cushion, I'm thinking about trying for a more leathery look to the material, but I don't know how to go about that.
Thanks again,
JFK