I like them The painting is very neat and nice. If I had to make one criticism, it would be the horse being less highlighted than it could be, this is a small thing and certainly nothing to stop people buying them.
Ebay can be a very odd place to sell stuff, you can put something through at a silly stupid (high) price to test the waters and it will be gone in seconds, something as good, at a modest price, can hang around for months, it is very much down to the right buyer seeing your stuff at just the right time for them to buy.
Re the German/Russian thing, people perceive the German uniforms and vehicles to be harder to paint, what with the camouflage patterns and such, while they think the Russians are easier. If you have two units, one German and one Russian, that are made up identically, most people would expect to pay a bit less for the Russians I have found.
People are very odd sometimes
