how do i add pictures from my pc to my inventory?

[Rolig Loon]

Click Me (or Avatar or File, depending on your viewer) >>> Upload >>> Image and pay the L$10 upload fee.

[Rolig Loon]

Click Me (or Avatar or File, depending on your viewer) >>> Upload >>> Image and pay the L$10 upload fee.

[valerie Inshan]

At the very bottom of your inventory, click the + sign > upload image (cost 10 L).

You can upload the following image file types:

• *.tga (Truevision Graphics Adapter)
• *.bmp (Bitmap)
• *.jpg (Joint Photographic Experts Group)
• *.jpeg (Joint Photographic Experts Group)
• *.png (Portable Network Graphics)

When uploaded, images are converted into a valid size. Valid scales are square powers of two. To prevent unintended distortion, keep this in mind when creating images.

The maximum resolution for uploaded textures is 1024 pixels. If you upload an image that is a higher resolution than this, it will be scaled down to pass the upload requisites.  Valid image sizes include the following values: 2, 4, 8, 16, 32, 64, 128, 256, 512, and 1024

Supported image formats

Second Life supports TGA (32-bit supports alpha channel), PNG (24-bit supports alpha channel), and BMP. When you upload an image, the Viewer internally converts it to JPG2000 for optimized future transmission. For best quality, try to avoid uploading JPGs; their already-compressed quality degrades further because of the double conversion.

Texture sizes

Textures should be as small as possible — texture size is highly context-sensitive so it takes experienced artistic judgment. For example, if you're texture-mapping a tiny pebble, its detail can be negligible compared to a giant tree in the same scene. For general use, 512x512 is a fair balance.

The maximum resolution for an uploaded texture is 1024x1024 pixels; if you upload a bigger image, it is scaled down to 1024x1024 pixels. Even if you have a fast Internet connection and a top-end graphics card, your computer can only display a finite amount of texture data.

http://community.secondlife.com/t5/English-Knowledge-Base/Uploading-assets/ta-p/700165