Every light, material, bsp and static mesh has a variable called Diffuse Boost. Turn that up a notch to see the effects of light bouncing. ( one global value for it is in WorldSettings -> Lightmass ) Also, what is the scale of your world compared to unreal tournament?
The environment still looks far too dark considering there's two decently sized windows with a skybox suggesting a strong ambient sky and halation on the windows. Shadows are blue because the ambient light from the sky is illuminating them, even more prominent on clear skies when there's no clouds diffusing the the blue…