  We present a magneto-photoluminescence study on neutral and charged excitons
confined to InAs/GaAs quantum dots. Our investigation relies on a confocal
microscope that allows arbitrary tuning of the angle between the applied
magnetic field and the sample growth axis. First, from experiments on neutral
excitons and trions, we extract the in-plane and on-axis components of the
Land\'e tensor for electrons and holes in the s-shell. Then, based on the
doubly negatively charged exciton magneto-photoluminescence we show that the
p-electron wave function spreads significantly into the GaAs barriers. We also
demonstrate that the p-electron g-factor depends on the presence of a hole in
the s-shell. The magnetic field dependence of triply negatively charged
excitons photoluminescence exhibits several anticrossings, as a result of
coupling between the quantum dot electronic states and the wetting layer.
Finally, we discuss how the system evolves from a Kondo-Anderson exciton
description to the artificial atom model when the orientation of the magnetic
field goes from Faraday to Voigt geometry.
