Thanks for considering Aspose.Pdf.Kit.
Since Pdf.Kit 2.0, form field of Adobe 7.0 + has been supported as a work-around way. Image field is also supported by Form.FillImageField( ). Customer can fill an Image Field or a Button with an image of .jpg, .bmp, .tiff, .gif, .png and so on. Here is an example:
Form form = new Form"fillImage.pdf", "output.pdf");
However, what do you mean that you want to "apply an image to a PDF dynamically " ? In the above, an Image Field or a Button is reserved beforehand when the PDF templete was under designing, so it is a static solution. And a dynamic one is not implemented yet. If it is not the way you want, please describe your requirement more clearly.