Fresh

It's OK. Americans would say, "in the future", but "in future" is OK as British English.

CJ

Edit: Dimsumexpress (below) noticed something strange. "nor was it possible" should be used, not "nor it was possible". [Good catch, DSE!]

Please tell us why use past perfect. I see no reason, am I missing something? The orange portion really had me going in the loop!

I had not seen her for years nor it was possible in future, but I still had her image very clear and fresh in mind.

I had not seen her for years nor it was possible in future, but I still had her image very clear and fresh in mind.
vs

I haven't seen her for years nor it will be be possible in future, but I still have her image very clear and fresh in mind.

[I have/had not seen her for years and never dreamt it would have been/thought it was possible, but I still had her image very clear and fresh in mind untill I met her a year back.]

Is the above grammatically OK now?

[I have/had not seen her for years and/yet never dreamt it would have been/thought it was possible, untill I met her a year back, but I still had her image very clear and fresh in mind.]

Please suggest

[I have/had not seen her for years and/yet never dreamt it would have been/thought it was possible, untill I met her a year back, but I still had her image very clear and fresh in mind.]

Please suggest

Ok I'll try one more time...

If you must use past perfect in the sentence, you should keep in mind the purpose, which is to from continuity between two past point in time. But your construction was too busy with other thought and too long. I would make this suggestion. Make this part a new sentence. "...but I still had her image very clear and fresh

I have/had not seen her for years and/yet never dreamt it would have been/thought it was possible, untill I met her a year back, but I still had her image very clear and fresh in mind.]

Ok I will make this part of sentence as new. Is the below ok now? Please suggest one more time. Thanks very well in advance.

I had not seen her for years and never dreamt it

I personally would phrase it this way.

I still have /had the image of her in my mind very clearly/ vividly, even thought I had not seen her for many years and never dreamed it was possible until I ran into her a year ago by chance.