Pictures are allowed, though it is generally recommended to re-save the file twice before uploading to a third-party website or attaching to your forum post. Re-save once as .bmp (to remove metadata that .bmp doesn't support) and then re-save again as .jpg/.png for uploading. Beware that identifying using a photo is not a reliable way of checking for impurities.
Check out the
FAQ for answers as to your color/purity question. Pure DMT is clear, but even a minor impurity could change the color. White DMT may still have colorless impurities. Minor impurities may or may not be OK to smoke, which is why performing your own extraction is important for identifying these impurities. Some color could be from other active alkaloids present in the bark that can affect your trip.
If you want the purest from your batch I would suggest trying the lightest color you see, but that is not a fully reliable indicator of purity without knowing the details of your extraction. Read through the FAQ and threads that it links to and you will be much more satisfied with the information.
Welcome to the Nexus!
The inner soul is full of joy. Reveal my secrets and sew me whole. With each day, "I" heeds your call.
You may not care the slightest and may not be the brightest, but from here "I" sees you're mighty for you created it all.
And the jumbling sea rose above the wall.
Through this chaos comes the order you enthrall.