I love your use of color blocking. Yellow is a hard color to paint for me. Do you use a base like white or somethingunder it ?
Those came out pretty nice, maybe hit them with another dull coat? I havnt used krylon, i bought the insanely expensive GW before i knew better. it works great, even if you pay through the nose for it.
Red on top of anything was alwways a problem that plagued me for years until I discovered the Citadel base colors.I use that Baal red I think it is which looks like brick red or clay colored. Then i cover it with a thin layer of blood red.They do have the best line of reds that work for me. I usually prefer the Vallejo colors though ;)