Challenge US Bank. Have the buyer's agent provide a list of comparables that justify their offer price. If there are circumstances and issues with your home that affect the price, then include those photos. If there are issues that are not easily visible or able to take a photo of then get 2-3 estimates for costs to repair. Remember, banks will only include repair/replacement issues for items that are none functional or missing. If an issue deals with something being outdated, the banks do not take that into account. An exampe would be that the home has an old inefficient oil burning furnace and the buyer will want to replace with a more efficient gas furnace. Banlks won't care. I do a large number of short sales and I am called by the banks to give market evaluation for their properties. I know what they look for and what they take into account. If the buyer's agent cannot provide comparables that are better then the appraiser provided to justify their offer, that bank will not beleive that the price being offered is within the market price range.
Also, remember that the banks really don't care what sellers sell their homes for, just what they will take to release the lien. If the seller has no money to make up the difference between offered sale price and what the bank will take to release the lien, then the seller has to go back to square one and try to locate a buyer that will pay the amount needed to release the lien from the bank.