hey Neo

What I see are the things I struggle with in a kit.

1. aircraft kits need the panel lines to show, try pre shading and weathering.  its the difference between your kit looking like a toy instead of a scale reproduction. 

Your aircraft kit is well balanced and put together, your painting is crisp and shinny, this is the same for your car kit.

2. painting, I can see the paint brush streaks on both kits, it looks too thick and washes out detail. 

one remedy for this in a hand painted model is 10 layers of very thin paint, gradualy building up to the thickness/shade you want.

hope this helps

Centurion