Looking good. However you didn't fill these gaps fully did you? Try to sand them a little but more in order to make these tops rounded.Then paint these tyres with the black paint again.
These are just showing shape from sanding. As for the gernade... my dad and sometimes I like collecting anything WWII and that is a Authentic Pineapple gernade he bought on Ebay.
I was just looking at it because the pin is missing and I was curious if I could make another. But that's something different
The next task for you Harry. Here is a pic below.You have to paint the P-40 "chin" and sides of the air intake with the white paint. But before you start painting wash the whole nose of the model with warm water and soap.Then get it dry.The nose has to painted on both sides like you can see in the pic.
And a tip for you. When we paint an element that has edges, for instance sides of a cube, we never go with a brush from one adge to anoter one.It is that because a paint from a brush is taken from the hand brush by the edges and usually runs down on the vertical side to the painted surfaces.That's way we always paint a such element starting from its middle and going to edges.
I think it is clear for you.