I have to say, I really love these past pictures! Here's a few suggestions to make it look a little closer to authentic. Of course, these only work if you're using photoshop of something.

-Play with the saturation. This might give you the colors that you're looking for. The color of the bites and lips might fade, but you can fix that with the dodge tool (or a similar technique).
-On a new layer, add texture to the clothes with the stamp tool (or something similar). Then adjust the layer to make it as light as possible while still seeing the pattern. You can also add color to this to add hints of secondary colors to the fabric.
-And lastly, try adding a tiny bit of backround or texture to the back ground. I've seen pictures that have just a few strands of what seems like silk in the corner of the picture, or hints of bamboo. You might also want to try having it lighter at the top of the picture.

Hope this helps ^^