Usually a picture will be either a pictogram or a logogram, but there are also about twenty five consonant symbols as well, and many more which stand for consonant clusters. I don't know for sure but I believe the underlined h is representing the voiceless pharyngeal fricative.
The reason it is so hard to speak is because, due to it being a Semitic language, the Ancient Egyptians had very little need to write vowels (rather akin to Modern Arabic, though the reasoning is slightly more complicated there). Although it worked fine for them, it does mean that it's impossible for us in the present day to be able to say with any certainty what the values of vowels may've been. For this reason, there are various theories as to how the glyphs should be pronounced.
Hope this helped!
Þu forstanden myccel gód Ængliscum!
Du forstår mal godt dansk!
Du verstehest sehr gut Deutsch!
Vous comprend trés bon, á la français!
Вы знат очынь хорошо па-Русский!
Folchen þeo meor goð Sursðk!
Du farstanden rijt gut Norslandich!