Consistency with Style:
No issues here. Uses the LPC palette and is in a tile format.
Quality and Skill:
Not bad for a first effort, but all the lack of solid shading makes it feel very flat, like you're looking at a 2d object and not a solid wall.
Judge's Opinion:
Not bad for a first effort. You might consider hitting up some pixel art forums and getting C&C on shading and such. I think you could be a good pixel artist with practice and instruction. :)