Tony,
I think your doing one heck of a job, they look great to me.
As far as putting on to much paint? Here is a quote from Bill Horan’s book Military Modelling Masterclass.
“It is always better to be too bold than too timid. The timid painter, whose shadows and highlights are so subtle as to be virtually indiscernible, often finds his efforts go unnoticed in the glare of display cases and the poor lighting so typical of miniature exhibitions.â€
Keep the faith, and carry on.