There is a Dataiku gallery project that shows a completed project using the plugin.
In order to visualize the retrained model, you can create a webapp that accesses Tensorboard. See this in the dashboard on the gallery.
The plugin also allows you to extract features from images for use in building predictive models; for example, the goal of the Two Sigma Connect Kaggle competition was to predict how popular an apartment rental listing would be, based on various characteristics, including pictures of the apartment. Using the deep learning image plugin, you can extract features that can be used in the model.
You can also build your own deep learning models for image classification using Keras and Tensorflow in Dataiku.