Simulations are presented for microlens arrays prepared via photopolymerization-induced phase separation in liquid crystal/monomer mixtures based on four-wave mixing, viz., interference of two horizontal waves and two vertical waves. The microlens forming process has been simulated on the basis of a pattern-photopolymerization technique in which the spatially modulated reaction rate has been coupled with the time-dependent Ginzburg-Landau (TDGL) equations via incorporation of the free energies pertaining to isotropic mixing, nematic ordering, and network elasticity. The simulation suggests that the LC microlens arrays are similar to compound eyes found in various insects such as flies, ants, and wasps.