Ive done charcoal portraits before. It depends on the artist. Usually about 200 dollars or more is what I would charge for a face portrait that when framed and matted would be the size of a small poster. The framing and matting cost a lot extra and most artist sell just the drawing and will drop it off or meet you at the place to frame it.
If I do an abstract drawing I usually charge like 250, but that's cuz my abstract is off the chain. That's off topic though.
I wouldn't do a portrait for less than 200, end of story, but my work is top notch and most people that just meet me ask me where I bought my paintings and drawings and I usually have to show them my sketch pad to prove its my work.
If its a friend Id do a portrait for 150 but it would have to be a damn good friend and a project I was interested in putting in my portfolio so 200 and up. Its gonna cost you another 100 or so to frame it. The good class is hella expensive.
Now I don't know what the dog looks like but I drew a tiger once and Im never doing that again. It took way longer than a persons face. The thing some people don't understand is that this is skilled labor and usually its going to take a long time.
Its best to give the artist several pictures to choose from. The best drawings have very bright brights and very dark darks.
I sure do love to do a charcoal portrait, especially when it comes together and the customer is happy. Its been a while for me as Im recovering from a nasty injury to my elbow, but my info should be on point. Feel free to PM me.
Oh yeah Id definetly go with a charcoal drawing for a portrait and if you want me to measure the size the drawings usually are I can later, but its late and I don't want to wake anyone up fucking about the house. Be sure to look at the artists portfolio and if they have a bunch of good drawings mixed in with some that are shite, well than chances are they are putting other peoples stuff in their portfolio. Ive had people try to buy my work at double to put their name on it to juice their portfolio (I told em where to go), but Im just saying don't get conned.