I agree, that looks more like a hill than a mountain. A mountain would be much taller and have stone, and also be far wider. I honestly would consider this far, far too time consuming, and would rather just generate a regular world in order to use mountains, that or mods.
I think we all missed the point. The point is that i'm awesome and can build hills, just playin. I don't like mods, they (can be) complicated to install and difficult to keep up with on every update. I'd rather play the game the way it is and enjoy myself. Plus i feel like building with a mod takes the human aspect out of your world.