As for the mockup, there are many NPA elements here, you should never use any photoshop tools. You must choose all of your colors and keep them under control. And as for structure, your tiles are very generic there's hardly any variation nor organic elements that would help increase the sense of a believeable/adventurable world.
I suggest to you, that maybe you should learn more of the basics of art. You know, how to shade, draw shapes, perspective,ect. It could really help you become a more effective artist.
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Seems as if you've directly taken one of iLKke's rocks from his mockup and pasted it only double sized
http://pixeljoint.com/pixelart/18364.htm
http://i102.photobucket.com/albums/m102/Josiahiouigi/rip3368875628-iaza.gif
As for the mockup, there are many NPA elements here, you should never use any photoshop tools. You must choose all of your colors and keep them under control. And as for structure, your tiles are very generic there's hardly any variation nor organic elements that would help increase the sense of a believeable/adventurable world.
I suggest to you, that maybe you should learn more of the basics of art. You know, how to shade, draw shapes, perspective,ect. It could really help you become a more effective artist.