FATECH,
Very nice, with a few comments on details:
In the pencil sharpening, the border between the yellow sides and the wooden tip corresponds to one yellow side (rather than the edge) directlt facing the viewer.
The outer shape and elements of the red object indicates a basically cylindical shape, but there is no corresponding colour transition from top to bottom.
The (limited) colour transition of the cyan(ish) shape makes it difficult to establish a shape perception.