visually I had to really stare to find what I consider flaw in this great piece of art and still they are small flaws to me. Most of the lines are great. not too thick not too thin. Some of the for me are the lines on the females chest. They V of her neck that meets the collar bone feels pinched and small. Also, the line that defines the outline of her left breast is too far to the viewers right. it should be closer to the zipper. The line should be smaller and the line should be thicker at the zipper and thinner as you get away to reflect that the breast is squeezed under her top and more relaxed for the portion not constricted. Lastly the line for his left shoulder blade is too high.
For originality and impact I feel like I have seen a lot of pictures of lovers holding each other. don't get me wrong I like pictures like that, but I see a lot of them.
I really like the hand drawn look of the piece for the technique. very well done. especially the feathers and the shading on his back.