  We present a full evaluation of the deeply virtual Compton scattering (DVCS)
cross section in the dipole framework in the small-x region. The result
features the $\cos \phi$ and $\cos 2\phi$ azimuthal angular correlations which
have been missing in previous studies based on the dipole model. In particular,
the $\cos 2\phi$ term is generated by the elliptic gluon Wigner distribution
whose measurement at the planned electron-ion collider (EIC) provides an
important information about the gluon tomography at small-x. We also show the
consistency with the standard collinear factorization approach based on the
quark and gluon generalized parton distributions (GPDs).
