I am going to answer the general question here first which will then lead into your specific one.
Yes but the scope must be limited and certain criteria should be met
There is not one right answer to blanket cover all of these questions. However most of what we are going to do at A&C will be seeing something neat and trying to do it ourselves. Full tutorials are not useful in this Q&A format. We need to fix more specific problems. Tutorials are better left to blogs and other dedicated tutorial sites. Having issues with specific steps and smaller parts of the whole is where we come in.
It does depend on the size of the project being reproduced. Some things can take several hours with varying tools and techniques. It is important to try and narrow things down and multiple questions might be in order. If you are not sure then a meta topic about your proposed question would not hurt at all.
For questions like this to succeed I think we need
- Picture of what you are trying to accomplish: Arts & Crafts is naturally very visual. Seeing what you are trying to do is almost a must!
- The name of the technique involved: To accompany the picture and narrow down what you are trying to achieve.
- Experience relative to the genre: This can give an impression of things like skill level and what tools are available. "I see that you have done [X]... that will help doing [Y]"
The last one not being super important but it can go a long way in some cases. Too much related information is rarely a bad thing.
Coming back to The name of the technique involved this is important because we want other that are searching for the solution to easily find there way. If you are not sure what exactly you are trying to replicate then a 2 question approach could be in order.
What is the name of this technique?
How can I get an [X] effect?
Where [X] is the answer to question 1
Different descriptive titles would be in order here but the point should be clear. In the case of writing the first question refer to our identity guidelines.
With your painting question I don't see any issue with it as long as you keep in mind what is written above. While painting that whole image could potentially be tedious I don't see an issue in trying to learn said technique. That being said, I am not a painter at all (I have only done 2 paintings). In comments you have added some very useful information.
"You know, that 'carved from wood' look you sometimes get in the jeweled-border Italian stuff." "You mean the trompe l'oeil wood bookcases and such?" "No, the acanthus-leafy bits." "Oh, yeah, with the blue plants on a yellow background, which looks hard enough, but then you get to the yellow plants on a yellow background?" "Yep, that's the one."
Taking that information would make a good skeleton for a question. If you can bring that level of detail to your questions I would think them to be well received and answerable.
The part that could be an issue is what paints were used. I am not sure what is required in order to determine that (Likely a Google search can answer that though).