Hi David,
For a first "serious" model you have done very well, it is difficult to give feedback without beeing able to see a model from many angles. Don't worry as we all have to learn photography to be able to post good pics on a model forum, but we can help there as well
So, photography first:
1. Do you have a "Macro" mode (Close up mode, often depicted with a flower)?
2. Can you set the " white balance"?
3. Can you set the appature?
4. Can you set the shutter speed?
5. Does your camera have a timer?
6. Do you have a tripod?
Basically don't use the automatic settings and try and use daylight rather than a flash. To do this you will need to be able to set the shutter speed slower than with a flash, down to 3-5 seconds. To be able to do this you will need a tripod and a timer. To get the best depth of field (Everything in focus, from the nearest to the farthest you will need the smallest appature possible. This is why you will also need a slow shutter speed. I used to use the daylight coming in through a window but I now use daylight bulbs, which mean I'm not restricted by the British weather
OK, the model:
1. Who was the manufacturer?
2. What scale (1/48?)
3. What paints did you use?
4. What decals did you use?
5. Any weathering techniques?
Nige (Lampie) has recently returned to modelling and, like you has made an excellent start.
Sorry if this seems like a lecture

it is not intended to be but it is is difficult to know what knowledge someone has and I'm just trying to give you food for thought
Gotta love all models of P-51's
Mal