Now comes the harder part, we will get the dodge tool again , but this time we will have a very small brush for the highlights of the edges, this will used to create a specular highlight effect that we see so commonly in metal, so you paint it in the areas where there are edges.
After the previous step we will create a selection , in this case the area above the top edge to give it depthness , and dont forget, always feather your selections in order to avoid hard edges
Following that we will do the same we did with placing the lightsource , but this time it will be inside the selection that we have made, so paint it with the dodge tool again NOTE : THE DODGE TOOL ALWAYS HAS THE "HIGHLIGHT" FUNCTION ON , we do the same with the edge in the left.
Now we select the area inside , wich wont sufer much editing, and feather it out and give a slight shadow coming from the top , for this we use the BURN TOOL with the same settings as the dodge tool, ( highlight mode ) .
Taking the next step will be doing the exact thing in step 8 , except that we will start shadowing the down areas , with the burn tool again.
This next step will be the one where you have to make it really seem that there is a realistic lightsource, so you select again ur starting selection of the rectangle, and apply again a filter modifier, but now ull right click and click on "select inverse" in this way we will be able to paint the exterior without messing around the interior ,
WE get the burn tool again and we will start painting in under with more itensity and very low itensity on the top , until we get a hard shadow, and try to make the transition between the elevated metal and the texture in the background seem noticable, by painting it with a small brush ( maybe 5 pxls ) with color burn in the areas that the texture starts.
We are almost done with Part 1 !! , now this is where your original part comes, you will pcik the dodge or burn tool and mess around till you think you got the desirable effeect, in my texture i darkened a bit the shadow areas, and made the transition between the base and the elevated metal even more noticable ,as well as some random noodling.
