In general, you should use one visual to present one (and only one) concept. On the other hand, more complex concepts may difficult for an audience to follow and for you to discuss. The entire concept may be introduced more effectively - and often more rapidly - by progressively disclosing successive elements of the concept. This stepwise approach is easier to explain, easier for your audience to grasp, and implies a logical sequence inherent in the concept you will present.
To make a progressive disclosure series of visuals, first create the visual in which the concept is described in full. This eventually will be the final visual in the sequence:
Next, remove elements of the concept one at a time. Begin by removing the final element first, then progressively earlier elements. Save your efforts at each stage under different names.
Finally, create the progression by reversing the order of the visuals, going from least to most complex. Number them right away so they stay in the proper sequence.
This approach is also more aesthetically pleasing - a seamless integration of images and text on successive slides results, without requiring much time or effort.