Nice start, not sure about finished one. Cap shading doesn't justify it's shape - it shows on the ends it is bowled, but it is looks flat in the middle. Also color ramps has no connection between them which makes it look like it not related ob]ects placed on one canvas. Usually I don't mess with people's colors, take a look at edit, it is pretty sloppy but you maybe find something useful. Kill two colors in overall palette, made a darkest green less saturated to bridge between blue and red, drop some sky colors on mashroom cap, play with a red rump (may ignore that)=)