Hardwood varnish, colour match?

I painted some exterior window frames and sills in the early summer using a Ronseal satin finish. I didn't want to cover up all signs of the original wood grain showing though, so went for a fairly light colour, but it had no real darkening effect on areas where the original finish was chipped so I ended with a patchy result. After this experience on one frame I touched in damaged areas with wood stain, which helped, but didn't totally solve the problem.
I have taken a photo of a "virgin" window sill, that is still in its original condition from when I bought the property. Anyone care to have a look and suggest the correct way of repainting? I do not really want to strip back to bare wood, the existing finish is very sound, but I think a dog has been jumping up and scratching parts with its nails. Thanks.
Pic is at
Best regards,
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.