Can someone brighten a photo of me up please?

Give a man a fish, feed him for a day

Teach a man to fish, feed him the rest of his life...

Where's the photo you need brightening?

Also, do you not have iPhoto (Mac) or Picasa (Mac, Windows, Linux) or Photoshop Mobile (any smartphone) you could do it with? It's very easy to do, would be happy to help you.

It is pretty simple to brighten up the photo,

If you would like, I could do the required edits for you and also record a video showing the exact changes made so that you can get a better idea of the steps incase you need to do more photos next time.

A photo that is a little underexposed can easily be fixed with almost any basic photo editing tool, but if a photo is very underexposed then there is a limit to how much you can correct for, furthermore, extensive exposure correction required you to also adjust the color, contrast and various other levels to keep the photo looking natural, but even then there is a limit of how much you can correct before clipping occurs.

If you have the images in a RAW format, then much more extensive edits can be done before clipping occurs.

If you want to do the edit yourself then using what ever editor you have, begin adjusting the brightness and if it gets washed out a little, then increase the contrast, if clipping happens then you will need to check if your editor has a levels function where you can more accurately control the specific areas that need to be brightened.

PS if your camera has manual controls and you are dealing with a scene that has complex lighting (strong shadows and highlights, then try this, try shooting 3 photos, 1 that is properly exposed, then another that is underexposed by 1 EV, then another that is overexposed by 1 EV, then after that, attempt to correct the image in post. Some cameras retail good shadow detail but clip very easily in the highlights and a slightly underexposed image can have the shadow and mid tones increased a little in order to have more highlight detail while having the mids and lows properly exposed. On the other hand, some cameras may store a decent amount of shadow detail but even more highlight detail, but have very little latitude in what you can due with the shadows before image noise takes over in the lows. In that case, a overexposed image may allow for a better final image when you are done with post production.

Ideally when taking your photos, you will want to enable the histogram (if your camera supports it), then if you know which type of corrections the images from the camera are best able to handle, then you can adjust the exposure to bring the histogram in that range before taking a photo when you notice strong shadows and highlights.