I love doing thisKeep in mind I'm no expert, here goes... Yes better pics and some comparison pictures would help give more descriptive answers. The pattern is clearly Mojave so that leaves the color to discuss. I wouldn't worry about the grey as that is one of the colors unique to them. In fact the gene actually lacks the normal black and is replaced by a greyish color also as they age the browns even start to becoe different shades of grey. The first picture he actually has the yellow pattern (Mojaves should lack gold and replace with a yellowish color) but in the second one looks a tad more goldish which isn't a good sign so a better picture would help. The only thing about her that I would question is the coloration of the yellow areas but to me she looks 100 percent Mojave.