The Cactusses looks really great now! Generally it looks good, but I think the background is a little noisy/messy for the eye to look at. I think it's because the darkest shades of brown are too dark compared to the black foreground. Maybe you should lighten the background colors up a bit. Also I think the masonry (spelling?) looks better in light brown than gray. The whole background is brown except that and it kind of "interfers" with the white masonry in the foreground blocks. I've made an edit to show what I mean:
http://i7.photobucket.com/albums/y291/flarfy/Momotaro.png?t=1205100216