Within the comment or label and so on it's not possible to display pictures. You could show pictures within table-charts by the expression-representation you enabled pictures or within a textbox which I could imagine will be come nearest to your wishes. With an expression like:
= if(1=2, 'qmem://<bundled>/BuiltIn/arrow_e.png', 'qmem://<bundled>/BuiltIn/arrow_n_g.png')
you could show dynamically the appropriate picture and with the same main-logic if and when you want to show the object itself by using a condition within visibility (tab layout).
Of course your condition needs to be adjusted to your requirements, maybe with a pick(match()) on your selection-states (querying per getselectedcount, getfieldselections and so on) or by changing variable-values through inputboxes or buttons.