From the picture posted and your description of tone irregularities, I can almost guarantee you have nothing to worry about. Anecdotally, my little guy sheds in sections (head, body, limbs, tail) in a different order each time. Slight color changes at a young age are nothing to worry about, Zeus looked quite brown, after his first shed with me his head took on an a light almost green tone, while the rest of his body remained a darker brown. During this, he shed his tail first which looked vibrant for a few days and immediately began to cloud up, so while the rest of his body was fresh out of shed, his tail was dull. The next shed was more in sync but he still retained his light green head, which was different from his body. I know it's easy to become paranoid of every little irregularity but just keep feeding and paying attention.
Do you
bathe your beardie? As this can help with the shedding process.