Well the first thing is to get or take better pictures. Detail, focus, light, shadow, all angles and sides with some closeups would help. A detailed description always helps when selling.
75% of the world hates drillings as they are different, 20% could not care one way of the other, 2% want a certain caliber or no interest, 2% like odd calibers if they know the gun is solid, 1% are real potential buyer because they want one and have the money in hand. Post a Parker and you will get 1,000 hits verses post a drilling and get 5 hits. Fact of life.
Since you have a small market you need to get as much attention as possible for your gun. Great photos help. Solid description and all the information you have will help. A good looking paper target to show the guns accuracy would even help.
Thin skin is a problem sometimes, just like the ease to take a shot at someone when they are not in the same room. Do not get mad, get even. Sell your gun and then post the results. Snide remarks have been made but you need to understand that there is solid basis for some of them. Learn from them and move on or ignore them.
I have taken a chance and bought a gun with poor pictures on the net but not in this price range. My wife will tell you that I am prone to buy anything. Bought a fuzzy pictured, busted stock, Baker awhile back and used the barrels on another gun, stripped the reciever to fix two other guns, then sold the reciever for more than the gun cost me in the first place. So you may get a buyer with your pictures but it will be a low price bidder only.
YOur other choice is to use a dealer and let them take a large part of the selling price as a consignment fee. I would try selling it myself first.
