I somewhat disagree with the existing answers and think the fundamental problems are these:
The d has lost too many properties fundamental to a d and the Latin alphabet in general:
- The bowl is too big and too thin in comparison to the stem.
- The bowl goes below the baseline – which is established by the rest of the text as well as the stem sloping away on that level.
- The opening is at an odd place, if not a wrong one: You would never leave a gap there when writing such a letter by hand, but instead put it at the upper collision of bowl and stems.
By form and spacing, the stem of the d integrates into the rest of the text like a letter. Except for the leftwards bend at the bottom and a bit of extra space on the left, it is exactly like you would expect an l at this position to look like.
To somewhat illustrate this, consider the following alternatives that only fix the two issues above:
Mind that these are still far from good, but at least you have a decent chance of decyphering them as intended: It’s either dahua or adhua and the colour or special position of the d make it clear which one is the intended reading. In the first case, you will first read dhua, which probably doesn’t fit your expected orthographic conventions and on a second glance, you will see the a to correct it. In the second case, you first read ahua, at a second glance you will note the d, and at third thought you will know where to place it.
Of course, it’s still a problem that you need those second glances and some mental work.