I think the tartan is ok. A lot of lines, bands, and squares to paint, its difficult to do them straights with all these elements. Perhaps too much complicated to be the first tartan you paint, but as i said, i like it. The thing that less likes me is the aspect of toy that have your miniature. And it's done cause, as Colin wrote, there is a lack of lights and shadows, and to profile in black don't help. To advance in painting, try to make degrees in light, put shadows, and to profile can use an the same colour than de darkest shadow with less water, or a colour darker than this shadow. If you watch at the coat the line black around it more than come between the elements and define the red, isolate it from the rest of the figure.