Hey man, nice drawing! Had a bit of a struggle finding what was wrong, but i think i've figured out quite a bit. Now, i don't fully know the intent behind the choices in this drawing, so if my feedback is impeding on that, you can ignore it if you want. First, there are absolutely inconsistencies with the hatching and the contours. If you really want this fixed, keep track of all the contour lines you've placed on the surface, and go off that. Also, on the sail, this was a problem, so i've advised to have the hatching lines follow the natural direction of each segment. For the form, the first problem is that we're sort of seeing this lizard from a 3/4 view from behind, so we should kind of be seeing remnants of volume from the other side. Moving on to the tail, i noticed some hatching following an incomplete path, so i tightened that up a bit. For the spines, keep im mind that they're moving away from us more as the lizard recedes into space, so we should be seeing the most of the back plane on the foremost spine relative to the head. Lastly, i researched some lizards to help me with this, and i noticed some things. Again, i don't know if this was your intent to stylized the legs this way, but they should be split into three sections, with one joint on each leg directly facing each other, as shown on my drawing. I also fixed up the sail, so here's some tips. Uuuhh it shouldn't end abruptly, the arc completes itself, and the spines at the end get more condensed. That's all for anatomy! Great work, and i hope this helps somehow with making subjects more accurate and believable! Also, srry for my bad draw-overs, i'm working with fingers and i don't yet have a stylus :( | Artwod Feedback