To be honest its difficult to pick one or two and guarantee they will look right in any given loco and sods law you often think if you'd bought them orientated the other way, they would have fitted better in another loco. The more you have , the easier it is to find the right home for them (invoice in the post Alan!).
Seating them in a bit makes a big difference - eg if they are leaning on an arm, sand a bit off so the contact point is a tight fit - in real life the weight is all in that part (that is, afterall, the general idea behind leaning on something!)
I look for the most natural positions though - the renditions are only as good as the person posing!
Joking aside, no connection, just a satisfied customer.