Improving another member's sheet?

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Let me quickly quote from the sprite sheet guidelines:

Sheet Completing
It's common for the rippers to overlook some sprite frames or elements, be it from forgetting about it or not ripping them because of difficulty. If you can rip those missing bits of the sprite sheet, or want to correct something that isn't right, feel free to fix it.

By submitting a sheet, you have the rights to limit its use and avoid theft with credit tags, but a genuine edit that completes the sprite sheet is not considered theft or any illicit action. Thus, do not complain if someone did the work of completing your rip for you.

Observations:

• If you're planning to fix/add missing frames to a sheet, please arrange them in a way that don't stick out too much from the original arrangement.
  
• Make clear what graphics you ripped and you didn't rip in the sheet, to avoid confusion.
  
• Do not remove the original sprite sheet's credit tag, if it has any.
  
• Do not claim that you ripped everything. That is sprite theft and you'll be severely punished.
  
• When submitting, make the thread in the right console section, explain that your sheet is corrective (you only fixed parts of it) and link to the original sheet.
  

So basically, if you want to complete a sheet, feel free to do so. Keep what can be kept and discard erroneous contents if necessary.

If a sheet is all wrong, you might submit an all new rip. Feel free to mention the original ripper, though! See this sheet for reference (Boo's rip had wrong shadows and outlines).