It's difficult to appreciate the detail of the model in this image. It basically looks like a silhouette of the phone with an iOS screenshot placed inside. When showing off a 3D model that has a relatively simple shape, it's good to provide alternate angles and/or closeups so your followers can see the details. Check this one out as an example:
I'm not taking issue with the model itself. Your other stuff looks good, and I'm sure this one is too. It's just hard to see the details because in the screenshot you provided.