It's quite odd, with me and creativity: I am a perfectionist, so I tend to work really hard on whatever I do, and find lots of faults while I do. But when I'm done with something, even if I still see flaws, I usually love it. Or rather, the point where I feel that I love it despite some remaining flaws is usually the point where I consider a piece of work 'done'. (Of course, nothing is ever really done.)
I know this is somewhat unusual, because a lot of creative people seem to always hate the results of their work.
Anyway... level making is different from the other things I do, like writing, and making jewellery, in that it feels effortless - like I'm doing it in a trance and then suddenly, when I wake, find it done, and am amazed by the results. So sometimes I feel like I haven't worked hard enough, or consciously enough, to love the results so much... *g*
(As always, a lot of the credit really belongs to the tileset designers, of course. I'm just combining their stuff...)