I like the forms, and I think you have chosen orientations for each that feel quite right to me.
I do find the colors a bit hard to believe, and I would be tempted to increase the contrast some so that the light areas are lighter.
On the topic of colors...
1st picture - "Auto Tone" with LR 4.3 and exposure reset back down to the default for my camera (+0 EV, spot metered at the centre)
2nd picture - "Auto Tone" with LR 4.3 and exposure reset back down to the default for my camera (+0 EV, spot metered at the centre)
3rd picture - "Auto Tone" required a bit more work to pull in the highlights (+0 EV, centre weighted metering)
... so for those three, blame Lightroom (;-) for the colours as it moved the highlights/shadow/whites/blacks sliders but for the last ...
4th picture (bottom) is "out of camera", with no adjustments from Lightroom (+0 EV, partial metering). So if the colours don't seem real, well, you'll need to take that up with Canon or God or Adobe ...
If I apply the same treatment from (1) and (2) to (4) then I get the attached... to get something meaningful with that photo in B&W is going to require PS. I"ve also attached an attempt to #2 in B&W... for some reason, B&W just doesn't seem to be working for me with these images...