as long as an image is at least sharp with good color - someone will want it some day. its uncommon enough that it isn't a snap shot (because birds fidget). so chances are it would sell. i remember someone of cafepress sold like 30 clocks, because the bird they chose the company had the same name. i wouldn't have chosen it but someone liked it. and it's the same here, if you like it, post it, because you never know what will sell or when. sometimes it surprises you. like autumn stuff almost never sells, and yet it is.
so whenever someone says they don't like it, unless they can give a good answer why it's bad, you can toss their idea. as long as you like it, that's whats important.
---Mike Savad