All Acceptable!
Good Luck

first one from the right and middle one have a relatively large black areas when the stroke overlaps or creates a conjunction, which could make the glyph heavier in a text.

keep up the good work.

Don't agree much with the last (leftmost). The first one however, is beautiful.

Khalid
ArabicType

I like the middle one most, the rightmost is acceptable too, the left most is bulky and don't even follow how medial heh is written (the middle one is very common in handwriting as well as calligraphy, but the rightmost is Naskhi form).

I think I should give explanations. I am not a fan of opening counters and loops. I find very often the black knot of Ain much more legible than the opened one. That's the flavour of Arabic script. But some designs demand more regular gray pattern.

As I am not a native speaker, I am framed by things I have seen and learned. So in some cases, to go forward, there is no other way but formulate hypothesis. So I put here that the initial/incoming and the second strokes of Heh are of the same origin:

Because there are numerous open variants of the Letter, I supposed it was possible to shorten the incoming stroke, removing the black area while still having two ears of Heh. Now I am sure, that changing the shape was a wrong way. But what do you think of this approach as shown below?

(Scherezade; the initial form unchanged)

I don't think this works, Marcin -- your modified Scheherazade on the right -- because the effect seems to be of a letter sloppily written rather than a new form. In the traditional open form (centre in your original image) the construction is clearly different from the closed form: the pen moves downwards from the horizontal instead of making a reversal. Your form looks like someone has tried to make the closed form but hasn't quite carried the stroke far enough.

@Marcin
Last question: what causes that some type designs repeat the initial form in the medial glyph? Is it a search for regularity?

No, it's called simplified arabic, in the past typewriters couldn't handle all of arabic forms in a single keyboard, so linotype AFAIK created yakout to reduce number of glyphs. so initial and medial forms in most cases are same, this also happens in most of final and isolated form. this tradition is continuing until now but I don't know the reason, because there is no such limitations in opentype.

Bahman

Bahman, while it is true that most letters in the Simplified Arabic scheme shared initial/medial and isolated/final forms, this was not the case with heh, which was an exception to that practice in Yakout. You can confirm this if you enter ه ههه in the Yakout text sample on Myfonts.

The fonts I have seen in which the medial heh takes the shape of the initial tend to be fairly recent designs, and it seems to be a stylistic decision rather than a technical solution à la Simplified Arabic. Some examples:

http://www.myfonts.com/fonts/hibastudio/hasan-hiba/
http://www.myfonts.com/fonts/linotype/hakim-ghazali/
http://www.myfonts.com/fonts/linotype/isra/
http://www.myfonts.com/fonts/linotype/sultan-nahia/
http://www.myfonts.com/fonts/linotype/firas/
http://www.myfonts.com/fonts/linotype/insan/

Interestingly, several of these were winners in the Linotype Arabic type design competition, and produced around the same time but by different people.

I work with the traditional open form. The other catched the eye too much.
But for example, such word as "Isfahan", handwritten in Nasta'liq with bulky Heh, gets some kind of a boost - an additional, eclectic, vernacular flavour . So, probably as with other ideas, that would do some work in custom lettering rather than in a typeface.

Thank you for explanation about the initial/medial issue.

Badr, that's a nice illustration. Is this from a book? Which one?