The implant does look quite close to the adjacent tooth, but if it has settled down and isn’t causing any pain or discomfort then hopefully it is okay. Have you asked your dentist why they inserted it in this position and discussed your concerns with them? If you are worried, I’d suggest getting a second opinion from a dentist who routinely places a lot of implants.
If your dentist has the experience of dealing with dental implants, then it might be nothing to worry about. However, you might ask him to be clear why it was done this way!