I'm try to push multiple image in a array and show in html page

Ionic Framework ionic-v3
1

I’m try to push multiple image in a array and show in html page but there are showing nothing
.TS

  takePhoto(sourceType) {
    console.log("coming here");

    const options: CameraOptions = {
      quality: 50,
      destinationType: this.camera.DestinationType.DATA_URL,
      encodingType: this.camera.EncodingType.JPEG,
      mediaType: this.camera.MediaType.PICTURE,
      targetWidth: 450,
      targetHeight: 450,
      saveToPhotoAlbum: false,
      sourceType: sourceType,
    };

    this.camera.getPicture(options).then(
      imageData => {
        this.base64Image = "data:image/jpeg;base64," + imageData;
       	   this.photos.push({
          "postaddimage":this.base64Image,
          "userid":this.user_id,
        });
       	this.photos.reverse();

      },
      err => {
        console.log(err);
      }
    );
  }

.html


    <ion-grid>
      <ion-row>
        <ion-col col-4 *ngFor="let photo of photos; let id = index">
          <ion-card>
            <!--<p class="text-right"><ion-icon name="trash" class="deleteIcon" (click)="deletePhoto(id)"></ion-icon></p>-->
          <ion-icon name="trash" class="deleteIcon" color="primary" (click)="deletePhoto(id)"></ion-icon>
            <p><img [src]="photo.postaddimage" *ngIf="photo.postaddimage"/></p>
          </ion-card>`
        </ion-col>
      </ion-row>
    </ion-grid>

where am doing wrong
Please help me out.