Yes—your method is valid. For manual exposure blending, there isn’t one “correct” layer order as long as you use masks to reveal the parts you want from each exposure.

A common workflow is to choose the exposure that best represents most of the scene as the base layer, place it on the bottom, and mask in other exposures for problem areas such as windows, sky, or dark interiors. Once you’re masking, the order of the other layers usually matters very little.

Other workable options include:

• using a single RAW file and recovering highlights/shadows if the dynamic range allows it
• using HDR merge/tonemapping software
• using exposure-fusion tools that automate this type of blending
• adding supplemental lighting during capture

If you want more precise and natural transitions, luminance masks are worth learning. They let you target bright or dark tonal regions more selectively than a hand-painted mask.

So: your approach is fine; just focus on clean masks and natural-looking results rather than a fixed stacking order.