Pink - The top part of the ridge is shaded, but that clashes with the light of the tile above it. There should be a tile just like that with light shading (there's several "option" tiles which are the same exact design but with different shading around it)
Blue - I almost think you should make that a disconnected spot, where the mountain continues diagonally, and use a one-tile mountain piece. That, or make the bottom-left of the circle thicker so as to support the height of the ridge you're currently using.
(also right tot he left of this color, your mountain ends with the wrong kind of ridge cap. There's one that's much more vertical and which properly ends the ridge--right now it looks like you used one meant to have a completely-dark tile beneath it--to me)
Green - The shading on these tiles are much lighter and usually reserved to the upper-most ridge pieces. The height of that range should be darker as it hasn't gotten into the higher elevation of the larger ridge in the top-right.
Purple - this tile clashes with the shading of the bottom-parts of the mountain base. I would suggest using a tile that continues the shading.
Red - I actually thought if the ridge went this way and connected that it would look better. It also would give more credibility to the sudden jaggedness of the smaller ridges as the elevation lowers.
(all just opinions of course ^_^ )