After only 48 hours, it's difficult to make any assessment of your results beyond knowing that the tissue was removed, and it looks like you haven't had any significant bleeding, such that you've developed a visible collection of blood (hematoma). A small amount of bleeding near an incision is not so unusual, though if it would persist, you should have your surgeon evaluate it. Since you just had your drains removed, I suspect your surgeon did examine your chest, so unless he or she commented, it's most likely fine. If it persists or worsens, you should return to your surgeon.