Knight- I almost liked the first version better. Having the darker side made it look like the left had lighting and that it was casting across the sig. The colors on the right side are more greener than the ones on the right when in the other version they were more blended in. Other than changing the text and brightening the right side I see no difference. Also you did not take my advice about the border. 
Spider-Man- Choose a color scheme and try to avoid having too many colors unless your going for a rainbow effect. With that said, my personal advice, change the left side's purple and light blue to a dark red and white like the other side. This will make the render blend better and will appeal to the eyes better.
