I encounter a problem with the positioning of my figures. Although I have used the
[!h]
parameter, the images are placed anywhere near the end of the document, and not in the logical place of the code...Could someone help me?

[!h]
parameter, the images are placed anywhere near the end of the document, and not in the logical place of the code...NEW: TikZ book now 40% off at Amazon.com for a short time.
!h
you don't allow top, bottom or float page placement. So you restrict possible positions. Try [!htbp]
to compare, that's the most relaxed placement. If one figure cannot be placed, and thus floats to the end, the other figures would come later too.NEW: TikZ book now 40% off at Amazon.com for a short time.