Attached Link: shadow catcher

i'v been playing with the lantern lighting effect, the last image in my gallery the shadow catcher, is almost there, is there anyway i can remove the artificial blue glow appearing on some of the columns, and although i've increased the pixels samples, i would like to get more crispness on larger size renders......

OS: Windows7 64-bit Processor Intel(R) Core(TM) i5-2430M CPU @ 2.40GHz, 2401 Mhz, 2 Core(s), 4 Logical Processor(s)  6GB Ram
Poser: Poser Pro 2012 SR3.1 ...Poser 8.........Poser5 on a bad day........
Daz Studio Pro 4.5  64bit

Carrara beta 8.5

Modelling: Silo/Hexagon/Groboto V3
Image Editing: PSP V9/Irfanview
Movie Editing. Cyberlink power director/Windows live movie maker

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