Sweet! A Derpy pic where she might be the hero!...Despite the skeleton ponies coming from the corridor and spying on Derpy and Carrot Top...Anyway, this is good! How the light is hitting everything is great. How it is drawn makes me think of the front page of a strategy video game for some reason. The Skeleton ponies add a good touch to what happened in that city, why are Derpy and Carrot Top there, along with the skeletons and how they are able to move. This pic is also a bit bone chilling from the skull ponies hiding in areas you don't think to look. All in all, great work! You make Derpy Hooves proud and a Legend!

Wow this is astonishing!
Your eyes are first attracted to Derpy and carrot top in the center, walking rather casually into some ruins looking of the Greek/Roman era (it is a bit hard to tell what exactly the buildings are from as some look Greek or Roman and some look Asian or even European. But this is not the real world and could just be what pony architecture is like). You notice their happy and care free expressions as they are exited to explore whatever mystery awaits them. As your eyes trail out, you find out that it wont be all that joyful. Using a perfect color composition, the ruins outside give off a really eerie and dark feeling. This is only emphasized by the hidden away undead skeletons, looking to ambush our carefree adventurers. This whole piece of artwork tells an exiting story, even creating a bit of dramatic irony with the skeletons waiting for the right time to attack the unsuspecting ponies.
The few things I have a problem with are the two ponies. It's hard to tell where they are walking, as the pathway they are following suggests that they should be going toward the viewer, but instead are walking/looking off camera to the left. This looks odd especially when you factor in that they could just slip past the skeletons entirely. Also, Derpy's expression (as cute as it is) feels a bit out of place. The artist gave her that (adorable) face to give off innocence and to create that sense of dramatic irony I mentioned. The problem is that it is a bit TOO cartoony. It is a very realistic style painting, and the very cartoon face, like I said before, feels out of place. On the other hand Carrot Top (meaning her expression) feels a bit more welcome, but that only adds to the contrast in style that Derpy already possessed. Another problem is the ray of light coming down. It is not directly centered on the ponies and takes some attention away from them. This makes it appear that they are not the real focus in a way. The light itself is a bit too hard as well, making the very eerie ruins in the background look not that eerie. It is a very warm yellow, and makes it a bit too distracting. It does add to the whole story behind it though, the yellow light making it feel like morning, as the adventurers got up early that day to have the whole day to explore.
That's really all I have to say; the painting tells a magnificent story about two adventures setting out on an exiting journey into a dark an forgotten ruin. The whole thing comes together almost perfectly as everything has surprising detail, and looks expertly put together.
Vision 5/5- You can tell what the artist wanted and envisioned, as they pulled it off very well.
Originality 3/5- Almost any RPG I have played had some sort of dungeon with skeleton warriors inside.
Technique 5/5- I don't really know what this is supposed to mean but it is a good painting.
Impact 5/5- this paining has a lot in it, everything to the story behind it to the beautiful colors used making it one of the most epic pony fan art to date.

(I don't really write these much, as I am not an expert. I really liked this piece of art and wanted to give my opinion as this is JUST my opinion. In truth I don't know that much about art, hehe.)