Acer palmatum 'Yves' Petites Feuilles'

Acer palmatum 'Yves' Petites Feuilles'
Japanese Maple 'Yves' Petites Feuilles'

CUTTING GROWN

Please see attached image from Meriggioli's book Bonsai Maples.  The core principle being illustrated -- thicken a section, cutback to a new leader, thicken next section -- can be used to grow any style of bonsai: upright, slant, cascade, etc.