Fi, they can only say no! If you write to them they don't know you from Adam so it isn't a problem if they write back and say no. But a lot of my sales come from trialling first. I just print a few and take them to the location and ask them to sell them and keep all the money themselves. If they sell, they can consider giving me an order or buying the pics off me or whatever. If they don't sell, fair enough, I can take them back or they can keep them as they wish.
I think I get about 70% follow up sales by doing that which is pretty good. And if it's people like the Red Arrows who don't want to sell anything that isn't taken by their own people then fine, I go up on the cliff top and sell my own to ther crowds and take every penny for myself instead of them getting a share. I should point out I do that with their permission... but I do NOT have to. They have absolutely no claim on any pictures I take whether it be of their planes or not. The only people I have to consider are the council if I am selling in public as there are rules and things regarding that.
My point though is that you'll be amazed at what sells and the fact is if you show a pic on here and people like it, people out there will like it as well.... even more so because on here people are a lot more picky and critical: that's what we are here for
You have already sold pics and yours are ample good enough to sell plenty more.
Cheers,
Rob