Any comments or criticism on this? Trying to play around with the dynamic color scheme, not sure if I did it quite right.

Thanks Gram

Looks good
I think you might like these, Color Combination Tools.

Nice work colours look good.

I really know very little about signatures, but the middle area between the boxes and the person seems a bit unnecessary.

caine: colouring looks fine in itself, but the important question is what did you want to do with the colouring? if you were after a certain style or a certain mood or something?

It's a good image and the colours work well. It might just be a matter of taste but I would be tempted to add some blue somewhere in the bottom right hand corner for contrast maybe close to the red.