You didn’t mention how you inserted your images. In case they are part of text flow, you may have included them As character frames. In this case, you can fine-tuned their position by choosing Vertical [Position] as From bottom. The by entry box becomes enabled and you set there the distance to the baseline.
This can be done independently for both frames which is handy if the images contain white space surrounding the main shape, this white space being counted in the frame dimensions (only aligning the frame is not enough to achieve nice-looking layout).
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