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I'd say this question is rather not suitable for this site -- even more if someone asks it as their first question here. If you "don't want to start badly", I think the best advice is to start either with an interesting non-soft question or with giving a good answer to a question of someone else.
Note that this is an old thread from last year; if you would like to propose further changes, I think it would be helpful if you would say a bit more, rather than just adding another alternative to an old poll.
Depending on what the comment says, on MO a comment upvote often means "this comment is mathematically correct". As one may find an error a considerable time later and as a wrong comment with many upvotes is likely to confuse readers, I think it would be helpful to allow withdrawing a comment upvote also after 60 seconds have passed.
For various topics below the line in your figure, there are concurring sites -- e.g. math.SE, stats.SE, physics.SE, Physics Overflow, cstheory.SE, while -- besides mailing lists -- there are likely not so many good alternative places to ask advanced questions on, say, group theory, number theory or algebraic geometry.
@AliTaghavi: Another hint, as silly as it may look like: you have spent 3400 points on bounties, leaving only 47. This makes you look like a new user, and new user's questions are in general less likely to be given the benefit of the doubt if there are shortcomings in the formulation, if they are written in bad English, if they look like textbook exercises, etc..
Good explanations! -- I also feel migration is not much service to the OP or to the target site. I think migration is rather beneficial in a certain sense to the source site if a question already has answers. -- Other than if an off-topic question is merely closed, the answers to a migrated question get deleted; this has at least two effects -- firstly, people don't get the impression that they could get such question answered on the source site, and secondly, the migration stub gets autodeleted after some days -- whereas a closed question with answers is not. (I'm not saying this is good!)
Sometimes migration even doesn't work if a majority of close voters choose the migration option, and the question is just closed -- I remember to have read that this may be related to tags which do not exist on the destination site(?)
I think this question is a good candidate -- the OP offered one ounce of fine gold for a correct answer. -- Of course this depends on the exchange rate between gold and MO points :-)
Why this strict dichotomy between "modelling questions are on-topic on MO" and "modelling questions are off-topic on MO"? -- Can't we say that particularly good such questions are welcome here, but we don't want a huge bulk of such questions -- in a similar way as with soft questions?
The question you refer to is not formulated as a mathematical question, and it is not clear to me what the precise question actually is -- "similarity / dissimilarity" of images is neither a standard mathematical term, nor is it defined in the question. To me the question looks like a kind of "fishing expedition".
@ToddTrimble: By the way -- are also deleted comments still visible for someone? -- If yes, for similar reasons one probably shouldn't too often repost comments to fix typo's etc. (otherwise avoiding such reposts is probably pointless).
