get a new leaf  
 
  blur it a bit,
 and do what marco did.
add some noise or texture,  then paint the highlights with a "lighten" or "overlay" layer..  blur and blend (on a new layer)..
then create a new layer and merge visable (cnt-alt-shft-e) on it..  set that on overlay and blur!!!    quite a bit!!..  lower the Opacity to taste (perhaps lower the saturation too)
Merge visable on a new layer and  use "sharpen more".. set to luminosity  and set the opacity to taste..  mask out the bad spots..
merge Visable again on a new layer and set that to color..  blur alot..., and set the opacity again..
the above would be my way..
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if you really want easy depth then create a path around the bug.. and bevel with layer options.. then mask.
either way.. get a new leaf