You don't need to resize to 400% -- this forum has zooming built in as long as you embed the image (rather than linking it, as you have done above).
So far I haven't managed to look at your spritesheet, because some 'Iphone' popup appears in front of it and won't go away. I suggest uploading the original-size image to imgur.com, which will allow embedding and doesn't include obstructive popups.
From what little I can currently see, one significant issue is banding -- you have a lot of it. Instead of placing line segments of similar length side-by-side, try to overlap or exaggerate them.
« Last Edit: August 18, 2013, 12:44:30 am by Ai »
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If you insist on being pessimistic about your own abilities, consider also being pessimistic about the accuracy of that pessimistic judgement.