FYI: With Photoshop use File > Save for Web... and use the
Quality slider to control final file size.
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For openers, a great first "at bat."
Consider the following as "food for thought," not criticism:
* If you intend to print, the image aspect ratio (width, height) would not scale to traditional print sizes such as 8x10, 16x20, etc. If your plans for the final results are to e-mail to friends/relatives or display on the web, then no problem. F
* If the final result will be framed, take into account frames will cover 1/4"-1/2" each edge, depending on print and frame size. In other words be sure to position image components in such a way to avoid a "too close to the edges" look.
* To me the overlapping and semi-transparent baseball glove is distracting.
* The sharp (vs. diffused) pic at the bottom right showing the back of his uniform draws attention away from the central batting image, which deserves most of the attention.
* In the interpretation I crafted from yours I swapped the bottom L and top R pics, diffused the bottom R pic and brightened his face (under the helmut) a little.
In the big scheme of things the above comments are really just nits. No matter what you decide to do, including 'nothing' which would b perfectly OK, someday he'll be simply tickled that Grandma made something as special as this.
Continued success. You're off to a great start.