Gluon field fluctuations in nuclear collisions: Multiplicity and eccentricity distributions

We discuss different sources of fluctuations in nuclear collisions and their realization in the IP-Glasma model. We present results for multiplicity distributions in p+pp+p and p+Ap+A collisions and compare eccentricity (ε2ε2, ε3ε3, ε4ε4) distributions in A + A collisions to the vnvn distributions in 10 centrality classes measured by the ATLAS Collaboration.