If I understand you, and as a visual artist, I'm still having trouble following your writing . . . but I'll try, and others with better reading skills will doubtless chime in!
!st - The images are contained within the leaf shape by creating a clipping layer, (we can elaborate if you need) or done by selecting the leaf shape and masking other layers.
2nd - There is probably a copy made of the original leaf layer and this is moved to the top of the layer pile. (Maybe more than one copy for other layer blend mode effects.) The other image is of placed in between. There are hue changes made to the leaf. Maybe the color is deepened and reddened in the original or not.
3rd - On the top layer, a deep sepia tone is applied. (several ways to do this, such as photo filter or hue/sat layer adjustments) Without trying it myself, I would guess that top layer is set to multiply or hard light blend. That would allow the top layer, the leaf, to apply its texture to the layer below. Blend-if sliders might alternatively be used, but I would have to try that out as that method is not my forte.
OK, time for other explanations!
PS: I'll try to create something like your example and see if my suggestions have any integrity :mrgreen: