If you enter a competition only jpeg files are accepted.
I always upload jpeg files.
See CHG Canon's reply for details of recommended sizing but my camera jpeg size fits in the sizes he refers to.
See Linda from Maine's reply re max website size.
Linda, I do mean UHH.

If you enter a competition only jpeg files are accepted.
I always upload jpeg files to the website.
Even those straight from the camera at max size.
I am not aware of a maximum size limit

In the old days (Film) they used to recommend a 125mm lens for portraiture, preferably with a widish aperture.
I had (and still have) a Tamron lens (pentax thread) and it was sharp but I made the mistake of choosing Nikon which meant using my old glass with a correction lens making it very soft.
I prefer sharp portraits.

I use Photoshop Elements 11 and sometimes Serif Photoplus X7

I've just re-read my previous reply.
I was more interested in putting my point of why the horizon was sloping and I forgot to mention the most important thing:-
Great shot!

I tried to do it but I'm no expert so I hope this will do!

(Download)

I have several old lenses and some are 50years old. I have to admit I bought them all from new.
I remember that some of them produced really sharp photographs and I still have the proof in negatives and prints.
I kept them so I could use them on any camera I bought with the same results.
This was true until I bought my first DSLR.
You see all of my previous lenses had M20 thread or were Tamron Adaptall.
The Adaptall (Original) fitting system adapters stopped being produced shortly after I bought the lens.
Now the bad part.
Without looking into the use of old lenses I opted for a Nikon DSLR, this was a mistake.
I like the camera and have no complaints with the results with the Nikkor lenses I bought.
I have since found out that the distance from the lens mount to the focal plane of the camera is smaller in Nikon cameras compared with other cameras.
This means that although old Nikkor lenses can be used on it with no problems, Practika or M20 lenses have to have an adapter with an auxiliary lens incorporated into it to allow for the shallower body if focus at infinity is required. Not many people don't want to focus at infinty!
Another lens behind the main lens unfortunately degrades the image and they are much softer than I remember and have proof of.
I have bought cheap and middle price range adapters and there isn't much difference between them.
I haven't used the expensive ones as I might as well buy a new lens.
The only lens I couldn't use at all was my Helios 50mm which came with my first SLR a Zenit B as the back elements of the lens go into the camera body when focusing.
It hits the auxiliary lens before full travel and I am worried about it hitting the mirror if used without the adapter.

In the past after the initial rush to have the latest camera is over, I found that in order to revive sales a price drop normally happens.
With this camera it may take a year.
Similarly I think the P900 will have a price drop when the P1000 is readily available in order to sell them off.

Rumours were pretty accurate then!
The only guess that I know was wrong is that the sensor would be 20Mp.
I love the P900 but I'll wait a while before I purchase the P1000 to allow the bugs to be sorted out and the price to drop.
I guess it could be a couple of years.
Good news though.

I hope you don't object to me replying as I'm not a street photographer but when I do it on holiday or visiting a town, I like to use my extreme wide angle on my Nikon D5200.
I like the pictures I get and the people at the front of the image think you are focusing on a distant object, aren't bothered and act naturally.
You have to like the result of course!
If you want to take portraits of interesting people in the streets, go with the advice above.
As I said I'm not normally a street photographer.

I notice that the screen shot itself has been cropped at an angle.
Narrower at the top R/H side,
Deeper at the bottom L/H side. This will slope the horizon.
You can post the image without posting the original if you want (Keeping to the image size rules of course).
As your new here all you have to do is ask how it's done and I'm sure you'll get a lot of replies.

Thanks for all your comments.
I'm still trying to figure out how to lighten the background in Photoshop Elements 11.
I'll keep trying and re post if I'm successful

NMGAL, I'll try. I've never done it before.
Have to learn how to do it first.

After a lot of trying I've finally managed to get my first reasonable "Bird in Flight" shot.

It was taken at RSPB reserve Bempton Cliffs, East Yorkshire, UK.
Camera: Nikon P900.
ISO: 400
Aperture: f/8
Shutter speed: 1/3200 sec.
35mm focal length: 380mm.
Cropped and exposure slightly modified in Photoshop Elements 11.

Thank you everybody.
The topic has expanded much further than I thought it would.
I've learnt a lot though.
Thank you all again