Thank you for updating your application! Please don't make a new thread every time you add new screenshots. Edit your application post above and reply to this thread. Just something like "update". This will make us notice your update
I looked at the screenshots of your Helms Deep. In some part you already use the double wall principle with pillars in front of the actual walls (you use it only for the Deeping Wall and the halls inside). The wall of the keep are looking too simple, there should be more details, like some pillars, an overhanging crown or arrow slits / small windows. Same for the tower, some horizontal structures, arches and other details would improve it greatly. Same for the bridge to the gate. You made some nice decorations in the floor of the courtyard but it still looks very empty.
You use different Materials for your walls and floors, which is good. To improve the large uniform faces of the walls and floors you could mix in some random materials like reddish and mossy cobble and cracked bricks (not sure if all those are in the rohan pack).
I can't see anything at on of the interior pictures (probably in the tower) it is too dark. I like the other interior pictures, walls and arches are very nice. But you really should add some more interior stuff (e.g. crates, tables, chairs, paintings, ...)
Your tower of Ecthelion has more details than your Helm's tower but its not really the style of MCME. I would like to see some pillars in front of the walls, some nice arches. You used some different materials but placed them a bit weird. Its better to have one main pillar material and one main wall material and use some other blocks only for details. The two main materials should not be too similar, they should give some contrast to the build either in color or in structure (e.g. bricks/cobble). I think it is very difficult (maby even impossible) to make diagonal walls and round towers looking nice in MCME. Regarding the iterior of your tower you should mix the different crates and boxes, Finrod already told you that for your ship
Aside of the themed builds you can improve your chances to get Artist by helping with
>>jobs and plotbuilds<<. When you finished such a task for a Designer, remember to ask the Designer to give points to your application as described
>>here<<.