the best way is to upload your very best work and advertise it. that's pretty much it. be sure the images are not blurry or noisy up close. that big ben picture is nice, but up close there is motion blur, i'm not sure its going to print.
here - this one, is probably the best of the bunch, but its not that sharp up close and it has motion blur, there may be issues down the line.
you need to add more keywords on all images
i can see this selling as well.
but then you have pictures like this. its a little cluttered with the palm on the right, and it will be much harder to sell. anything a buyer can take (even if they never have plans to), will turn off a buyer the "i can do that" thought they may have may turn them around out of the store.
i don't know of too many people that will want a partly in focus piece of material.
so you have some images that make me scratch my head and others that i can see selling, while others may have printing issues. you need more keywords overall. and you have to advertise yourself. if you let it sit, it won't sell. some of these will be very hard to market. either because they have a snap shot quality, or they are super common, or uncommon, in a way that it may not fit into any decor.
if you can get sharper images of big ben, and fill a gallery with that level of quality, same with the horn, you should do pretty well here.
---Mike Savad