Pictures Lab is a very nice photo editing app for your Windows Phone. The app offers a wide selection of editing tools that includes filters, borders, exposure adjustments and more. The app is in the top five photography apps on the Marketplace and has recently had it's price cropped. The original $1.99 price tag on Pictures Lab is dropped to $.99 making the app a steal of a deal.
Pictures Lab has Facebook and Twitter integration to make social sharing of your photos easier. Settings allow you to set the image quality on images you share and save. Plus you can add an artist name (e.g. copyright) to the image's EXIF file. plus you can set the image quality in the app's settings.
If you're not sure about Pictures Hub, there is a free trial version available to let you try before you buy. The full version is running $.99 and you can find Pictures Lab here at the Windows Phone Marketplace.