well, i shall comment on both, csm, to give you your third, and EE to give you your first.
CSM:
signature: solid effort. the only real drawback i can find is the shadow, frontcannon has addressed this already. also, just from personal preference, i dont like the colours, but that's just me.
realistic piece: texture, texture, texture. please. it just doesn't look right without it, but, as it's a WIP, you're doing brilliantly. perspective is off in almost everything, the table slopes from down to up... that shouldnt happen, if you're looking at it from the angle you are. the flowers need a little bit more work, texture, and i'd check if flowers really hang like that out of a vase... overall, though, you did quite well, and please keep up the WIP
Epic Epiphany:
it is brushed very well, first thing i noticed was the very dark area in the bottom left, there is nothing there, which, to me, took a bit away from the overall image, it was my first focal point... background is very well done, colours work well. the people, are also brushed well, the girl, firstly, and this is my main rant, doesn't look real enough. perhaps you did too good? lighting is perfect, and you have made very few (and those you have made are barely noticeable (look at the hair of the female, and you may see one very small flaw). nice touch on the man's eyes, colouring is flawless there, recoloured well.
you have done a very good job. well done, and keep it up.
just have to ask, though... is that you?