A lot of the Bellis perennis cultivars have been selected for their large size (both flowers, and leaves). It makes them more conspicuous in gardens ;-)
Viola is either near the V. tricolor end of the hybrid spectrum or in fact a pure form of it. Flowers do appear a little built-up.
Structurally not typical of the hybrid pansies at all; looking at enlarged view of flowers again not sure they aren't in fact of fairly usual shape for V. tricolor. Coloring of flowers of this plant highly variable to begin with, not including the range added by garden forms. Violets and violas have been fiddled with extensively and there is all manner of hybrids and as well as forms of pure species being grown.
It has various colours and shapes and sizes. Some times they are bigger and simetimes tehy are smaller.