for example I have pins, prints and dakis. am I allowed to post ad picture with site were merch can be bought? or I am allowed to post arts from my merch only?

From the uploading guidelines under bad things to upload:

Advertisements: Low quality ads or ads without artistic value.
Images with only a small part advertising something (like a footer with a Patreon link) are very much welcome here.
Adoptables/character auctions, YCH auctions, or any other types ads for auctions are not permitted.

So it's hard to say without seeing exactly what your ads look like.

quenir said:
From the uploading guidelines under bad things to upload:

So it's hard to say without seeing exactly what your ads look like.

like this https://bsky.app/profile/igny.bsky.social/post/3lm6fl4fhis2y

There are restrictions on what is acceptable within the posts themselves, but you can write almost anything you want in the description.

For example you could upload downscaled versions of the art in your merch without adding prices or text and then leave the explanation and links in the description

igny said:
like this https://bsky.app/profile/igny.bsky.social/post/3lm6fl4fhis2y

No those don't look acceptable. Posting the daki designs with a link in the description would be.

igny said:
like this https://bsky.app/profile/igny.bsky.social/post/3lm6fl4fhis2y

No.

But what the Mutt said, if you have the clean full's of the dakimakuras you can definitely post those as is and do the whole schpiel in the description

nin10dope said:
But what the Mutt said, if you have the clean full's of the dakimakuras you can definitely post those as is and do the whole schpiel in the description

Not necessarily "clean full" versions, though that would be preferred.

If the artist wants to prevent unauthorised use of the prints, they may post lower quality versions of the design and include watermarks plastered across it to dissuade reuse.
For the NSFW designs, censorship may be used but it can backfire if it is not done tactfully (i.e., viewers generally don't like full censorships). Alternatively, posting the uncensored version may actually benefit to the exposure of the daki sale.

thegreatwolfgang said:
Not necessarily "clean full" versions, though that would be preferred.

If the artist wants to prevent unauthorised use of the prints, they may post lower quality versions of the design and include watermarks plastered across it to dissuade reuse.
For the NSFW designs, censorship may be used but it can backfire if it is not done tactfully (i.e., viewers generally don't like full censorships). Alternatively, posting the uncensored version may actually benefit to the exposure of the daki sale.

Oh yeah by all means you can slap a semi-opaque watermark or artist's signature across it. One of my friends does it in a diagonal pattern like hazard tape