Avaz supports multiple picture sizes. The number of pictures per screen can be gradually varied as the child progresses. You can start even with one picture per screen and go all the way upto 40 pictures per screen.
Tap Settings > Pictures per screen (under Picture Settings section), to change the number of pictures per screen.
Avaz Together basically supports 3 picture sizes for which the vocabulary has been optimized - 15 pictures (level 1), 24 pictures (level 2) and 40 pictures per screen (level 3). It is recommended to keep this setting in sync with the vocabulary level for which it is optimized, since this ensures consistent motor patterns for the child as he progresses from one level to the next. The number of pictures per screen can be gradually varied as the child progresses