Those pictures do not show the underneath
of the penis. If your foreskin can slip just
over the corona (back of the glans) but no further, then the frćnulum is likely limiting it.
The specific advice you need is frequently repeated. You need to perform both
the stretching procedures we detail, the one (or ones) for stretching the foreskin opening
, and the one for stretching the frćnulum, which tends to require more time and dedication, but is relatively easy to actually do.
Interestingly, the advice is almost always the same - simply because the problem is actually, almost always the same.