Thank you Mike for your keen reply and good story as usual.
So your advice is to keep drawing commissions , whatever they are, because in my position any commission is good commission...
So not matter if there's two faces or single one, I shouldn't overcomplicated the cost, counting down single items on the subject to add or reduce the price for the whole...
I get your point!
It would be stupid calculate the commission by counting down the multiple items included...
Like for example if the subject is wearing hat = £1 more to the price, if the hat is large = extra 50pense ...
An additional face = £10more to the price etc.
Yes, it sounds stupid to me right now.
Thank you!
I couldn't figure it out by myself...
I used to ask for £70 for A3 size drawing or painting.
Even last year...
But I felt I don't like to work on to strange subject for this much and be happy...
I'd rather refuse it, and draw my favourite subject to enjoy it fully.
So when I was asked by work mate to draw his daughter I said £80 for A4, and £110 for A3.
Honesty?
I wanted him to get scared and bugged off, or accept it and draw his princess with full will to do my best to please him.
He said yes, even if I've never have asked nobody for that much!?
I just asked him for the money that will satisfy my efforts, and make me willing to do it for him...
This is also gonna be my guide point, and I like your *slide idea...
I need to have some guideline of pricing my arts...
It's never been easy task to me, even now, after few years of drawing/painting I'm still confused of how much to charge.
He accepted it, and therefore the above prices became my permanent fees for commission.
Today coincidentally another workmate asked for commission...
He mention that he used to do calligraphy, so I said I do it too to write the thankful letter for the client, which I'm attaching to the drawing...
He went - what drawing you do...
Then I did show him few, and this is how I have him on my fb page

He did accept the price too, so here we are.
It seems the price I set works well?
It's not too low, but it seems it isn't too steep too?
Just good enough that people seems to consider it as an affordable?
I have one more case to share...
One lad started chatting regarding commission of the old car.
Large size, at least 60cm/50cm but maybe even larger...
While we were discussing the subject matter, we've got to the point of the price...
I said for such huge size I'll need much more time to finish it, also I'll use more graphite lead to cover it, and then the paper cost etc, but we were actually considering to draw it on to the plywood...
Nevertheless, I did ask for £200, saying that it will be first time I'll do such large size drawing and on the wood for first time, so it will be a good experience for me too, and because I'll benefit while doing this commission, I will be happy to reduce the price down to £150.
Soon after I finished my words I could notice the change into his voice, he started talking about more time to rethinking it, maybe smaller size, then that he didn't know it will cost that much, and at the end he went he'll think about it and will let me know...
As you expect I haven't heard from him since then

Well, this is another sort of people I'm not too appreciate to meet.
Such client used to have ambition to get masterpiece, something extraordinary, but won't pay too much for it, best thing would be if I could do it for fewer ££ to make them happy.
I remember one old case, where two women asked me for commission, and in both cases £70 for A3 size drawing was way too much to accept (two years ago I think), so I started asking what money they were thinking to pay for my about 4 weeks of drawing (it usually takes me that long because of my working hours...), they went then - about £15, or £20 ...
I told them I'm selling my prints for £19, because they cost me that much to pay for colour match, for archival paper to print them on, and including postage it made me to offer the single print fot £19.
So I said why would I draw the portrait for four weeks for you for £20?
Well...
I think some people don't know how much effort we put into the process of drawing for them?
Thank you Mike.
You made the things much clearer.
I'll stick to my already settled prices, and I won't be overcalculating it.
It's not point to consider how much for one bigger face to charge or how much for two smaller...
I'll stick to my price, because at the end is the client, and if I confuse him what I charge for, he might be not appreciate for it at all, because the calculation will get too complicated and unclear...
I like your advice about pricing my art at some gallery?
I never thought about it!
Yes, they will know whether it's worth anything or nothing, and how much eventually...
Great point and advice!
Thank you!